I had a issues with my power supply no after i

Some products require time to turn on. These products might or might not give feedback in the form of blinking light(s). Wait a minute for the power light to turn on before proceeding to the solution.If your product does not respond when you try to print, press any button on the product to wake it from power save mode. Wait for the product to initialize, and then try to print again.
Try the following solutions in the order presented to resolve the issue. When one of the solutions resolves the issue, there is no need to continue troubleshooting.Solution one: Press and quickly release the Power button Press and quickly release the Power button ( ) to start a Power On/Off cycle. Do not hold down the button Figure 1: Press and quickly release the Power button If you press and hold the Power button too long, the product might turn on and then off without restarting. If this happens, press and quickly release the Power button ( ) again.If these steps resolved the issue , you do not need to continue troubleshooting.If the issue persists , continue to the next solution Solution two: Check the electrical connections and outlet Unplug the power cord from the electrical outlet, or the power strip or surge suppressor Carefully inspect the power cord for visible damage.If the power cord or power module shows any damage, contact HP to replace the power supply. Disconnect the power supply from the rear of the product.Wait at least 30 seconds, and then plug the disconnected power supply into an electrical outlet. Do not use a power strip or surge suppressor.If the green light (LED) on the power supply does not light up, contact HP to replace the power supply.Reconnect the power module to the product. Press and quickly release the Power button ( ) to turn the product on.If the product still does not turn on, connect the product to an electrical outlet in another room, and then quickly press and release the Power button ( ) to turn the product on.If the product turns on , the electrical outlet in the original room caused the issue.If the product still does not turn on , continue with the next solution.Solution three: Check the USB cable Disconnect the USB cable from the rear of the product.Figure 2: Disconnect the USB cable from the HP product Press the Power button ( ) to turn on the product.If the product turns on with the USB cable disconnected , replace the USB cable If the product still does not turn on , continue to the next solution.Solution four: Check the battery If your HP product has a battery, follow these steps:Check the battery light. If the light is red,recharge the battery.If the battery light is still red after recharge, replace the battery.Figure 3: Removing a battery (example only) 1 - Slide the battery release slider in the direction of the arrow 2 - Remove the battery Instructions for recharging and replacing a battery are available on the HP Web site.Solution five: Replace the power supply If you have completed all of the troubleshooting steps and are still experiencing a problem, contact HP to replace the power supply for your product Solution six: Service the product If you have completed all the preceding steps and are still experiencing a problem, service the product

Try the following solutions in the order presented to resolve the issue. When one of the solutions resolves the issue, there is no need to continue troubleshooting. 1) Press and quickly release the Power button ( ) to start a Power On/Off cycle. Do not hold down the button If you press and hold the Power button too long, the product might turn on and then off without restarting. If this happens, press and quickly release the Power button ( ) again.

• If these steps resolved the issue , you do not need to continue troubleshooting.
• If the issue persists , continue to the next solution.

2) Unplug the power cord from the electrical outlet, or the power strip or surge suppressor.

1. Carefully inspect the power cord for visible damage. If the power cord or power module shows any damage, contact HP to replace the power supply.
2. Disconnect the power supply from the rear of the product.
3. Wait at least 30 seconds, and then plug the disconnected power supply into an electrical outlet. Do not use a power strip or surge suppressor. If the green light (LED) on the power supply does not light up, contact HP to replace the power supply.
4. Reconnect the power module to the product.
5. Press and quickly release the Power button ( ) to turn the product on.
6. If the product still does not turn on, connect the product to an electrical outlet in another room, and then quickly press and release the Power button ( ) to turn the product on
7. If the product turns on , the electrical outlet in the original room caused the issue.

• If the product still does not turn on , continue with the next solution.

3) Disconnect the USB cable from the rear of the product

1. Press the Power button ( ) to turn on the product.
2. If the product turns on with the USB cable disconnected , replace the USB cable
3. If the product still does not turn on , continue to the next solution.

4) If your HP product has a battery, follow these steps:

1. Check the battery light. If the light is red, recharge the battery.
2. If the battery light is still red after recharge, replace the battery

5) If you have completed all of the troubleshooting steps and are still experiencing a problem, contact HP to replace the power supply for your product

6) If you have completed all the preceding steps and are still experiencing a problem, service the product

http://search.hp.com/query.html?charset=iso-8859-1&lk=1&la=en&nh=10&st=1&rf=0&qs=&tridion=0&hpvc=sitewide&uf=1&qt=Officejet+8500

Issue The HP product repeatedly turns off. Cause When low-power problems exist, the product might turn off repeatedly. Low power is a common problem in many home offices because of the number of electronic devices concentrated in one area. Solution one: Press and quickly release the Power button Follow these steps to turn on the product correctly.

1. Remove any memory cards or USB drives from the HP product.
2. Press, and then quickly release the Power button ( ) to start a Power On/Off cycle. Do not hold down the button . Figure 1: Press and quickly release the Power button

If you press and hold the Power button too long, the product might turn on and then turn off without restarting. The product might also appear to be turned off in Powersave mode. In either case, press, and then quickly release the Power button ( ) to turn on the product. Solution two: Check the electrical connections and outlet Follow these steps to make sure that all the power systems work correctly.

1. Unplug the power cord from the electrical outlet, or the power strip or surge suppressor. Power module Power cord NOTE: The power cord detaches from the power module. The term power supply refers to both the power module and the power cord.
2. Carefully inspect the power supply for visible damage. If the power cord or power module shows any damage, contact HP to replace the power supply.
3. Disconnect the power supply from the back of the product.
4. Wait at least 30 seconds, and then plug the disconnected power supply into an electrical outlet. Do not use a power strip or surge suppressor. If the green light (LED) on the power supply does not light up, contact HP to replace the power supply.
5. Reconnect the power supply to the product.
6. Press and quickly release the Power button ( ) to turn on the product.
7. If the product still does not turn on, connect the product to an electrical outlet in another room, and then quickly press and release the Power button ( ) to turn on the product.
   • If the product turns on , the electrical outlet in the original room caused the issue.
   • If the product still does not turn on , continue with the next solution.

Solution three: Make sure that other devices are not causing the issue Follow these steps to make sure that devices plugged into the HP product are not causing the problem

1. If the parallel and universal serial bus (USB) ports of the HP product have other devices plugged into them, unplug those devices.
2. Press the Power button ( ) to turn on the HP product.
3. Monitor the HP product to see if it turns off again.

• If these steps resolved the issue , there is no need to continue troubleshooting.
• If the issue persists , see the next step.

Solution four: Service the product If you have completed all the steps listed above and are still experiencing a problem, service the product.

Solution one: Press and quickly release the Power button Follow these steps to turn on the product correctly.

1. Remove any memory cards or USB drives from the HP product.
2. Press, and then quickly release the Power button ( ) to start a Power On/Off cycle. Do not hold down the button . Figure 1: Press and quickly release the Power button Illustration of pressing and releasing the power button

If you press and hold the Power button too long, the product might turn on and then turn off without restarting. The product might also appear to be turned off in Powersave mode. In either case, press, and then quickly release the Power button ( ) to turn on the product. Solution two: Check the electrical connections and outlet Follow these steps to make sure that all the power systems work correctly.

1. Unplug the power cord from the electrical outlet, or the power strip or surge suppressor. Power module Power cord Illustration: Power module Illustration: Power cord
   NOTE: The power cord detaches from the power module. The term power supply refers to both the power module and the power cord.
2. Carefully inspect the power supply for visible damage. If the power cord or power module shows any damage, contact HP to replace the power supply.
3. Disconnect the power supply from the back of the product.
4. Wait at least 30 seconds, and then plug the disconnected power supply into an electrical outlet. Do not use a power strip or surge suppressor. If the green light (LED) on the power supply does not light up, contact HP to replace the power supply.
5. Reconnect the power supply to the product.
6. Press and quickly release the Power button ( ) to turn on the product.
7. If the product still does not turn on, connect the product to an electrical outlet in another room, and then quickly press and release the Power button ( ) to turn on the product.
   • If the product turns on , the electrical outlet in the original room caused the issue.
   • If the product still does not turn on , continue with the next solution.

Solution three: Make sure that other devices are not causing the issue Follow these steps to make sure that devices plugged into the HP product are not causing the problem

1. If the parallel and universal serial bus (USB) ports of the HP product have other devices plugged into them, unplug those devices.
2. Press the Power button ( ) to turn on the HP product.
3. Monitor the HP product to see if it turns off again.

• If these steps resolved the issue , there is no need to continue troubleshooting.
• If the issue persists , see the next step.

Solution four: Service the product If you have completed all the steps listed above and are still experiencing a problem, service the product.

If you need more help come back.Post / thumbs / testimonial are welcome!

Hi,

You can try the following steps:

1. Unplug the power from the laptop and remove the battery then press the power button of the laptop for 15 seconds

2. Put the battery back in, turn on the laptop without plugging the power to the laptop (If this didn't resolve the issue)

3. Remove the battery and press the power button of the laptop for 15 seconds, after that, plug the power cord and turn on the laptop (if this didn't resolve the issue)

4. Remove the power cord and press the power button of the laptop for 15 seconds, disconnect the Hard drive and turn on the laptop (If this didn't resolve the issue) reconnec the hard drive

5. Remove the Optical Drive and turn on the laptop (If this didn't resolve the issue) reconnect the optical drive

6. Remove the memory chip, if you have 2 memory chips installed in the 2 memory slots (remove both of them) now test each one of the memory to each slots turning on the laptop. (If this didn't resolve the issue) Put the memory chip back in

7. Reseat the CPU and try to make sure that it's installed properly. Turn on the laptop and test if it's gonna work (If this didn't resolve the issue)

8. Reseat the power cords coming from the power supply of the laptop and test the laptop. (If this didn't resolve the issue)

9. Disconnect everything and just leave the CPU installed and turn on the laptop.

10. If all else fails, there's a big possibility that the problem may be with the power supply or the motherboard of the laptop.

(Note: you may try to clean your computer if there is a large amount of dust. You may try to remove the CMOS battery)

regards,

sl4x

Hi,

You can try the following steps:

1. Unplug the power from the laptop and remove the battery then press the power button of the laptop for 15 seconds

2. Put the battery back in, turn on the laptop without plugging the power to the laptop (If this didn't resolve the issue)

3. Remove the battery and press the power button of the laptop for 15 seconds, after that, plug the power cord and turn on the laptop (if this didn't resolve the issue)

4. Remove the power cord and press the power button of the laptop for 15 seconds, disconnect the Hard drive and turn on the laptop (If this didn't resolve the issue) reconnec the hard drive

5. Remove the Optical Drive and turn on the laptop (If this didn't resolve the issue) reconnect the optical drive

6. Remove the memory chip, if you have 2 memory chips installed in the 2 memory slots (remove both of them) now test each one of the memory to each slots turning on the laptop. (If this didn't resolve the issue) Put the memory chip back in

7. Reseat the CPU and try to make sure that it's installed properly. Turn on the laptop and test if it's gonna work (If this didn't resolve the issue)

8. Reseat the power cords coming from the power supply of the laptop and test the laptop. (If this didn't resolve the issue)

9. Disconnect everything and just leave the CPU installed and turn on the laptop.

10. If all else fails, there's a big possibility that the problem may be with the power supply or the motherboard of the laptop.

(Note: you may try to clean your computer if there is a large amount of dust. You may try to remove the CMOS battery)

regards,

sl4x

Hi,

You can try the following steps:

1. Unplug the power from the laptop and remove the battery then press the power button of the laptop for 15 seconds

2. Put the battery back in, turn on the laptop without plugging the power to the laptop (If this didn't resolve the issue)

3. Remove the battery and press the power button of the laptop for 15 seconds, after that, plug the power cord and turn on the laptop (if this didn't resolve the issue)

4. Remove the power cord and press the power button of the laptop for 15 seconds, disconnect the Hard drive and turn on the laptop (If this didn't resolve the issue) reconnec the hard drive

5. Remove the Optical Drive and turn on the laptop (If this didn't resolve the issue) reconnect the optical drive

6. Remove the memory chip, if you have 2 memory chips installed in the 2 memory slots (remove both of them) now test each one of the memory to each slots turning on the laptop. (If this didn't resolve the issue) Put the memory chip back in

7. Reseat the CPU and try to make sure that it's installed properly. Turn on the laptop and test if it's gonna work (If this didn't resolve the issue)

8. Reseat the power cords coming from the power supply of the laptop and test the laptop. (If this didn't resolve the issue)

9. Disconnect everything and just leave the CPU installed and turn on the laptop.

10. If all else fails, there's a big possibility that the problem may be with the power supply or the motherboard of the laptop.

(Note: you may try to clean your computer if there is a large amount of dust. You may try to remove the CMOS battery)

regards,

sl4x

These are the reasons why your pc wont switch on

1. Defective power adapter
2. Defective Processor
3. Defective Motherboard
Note: If you replaced your motherboard check the specs on the previous motherboard it should be the same part number or a replacement part number.

You can purchase your motherboard to HP System Board HP Motherboard

Here's a sample video

Hi
Disconnect the unit completely from the AC outlet for 5 or 10 minutes, then plug it back again.It will works.
Also I suspect it may be a loose power switch, or a problem with the power supply.
If it is a USB printer that derives power through the USB cable and not from a seperate power cable, then check the USB cable. That may be the source of the problem if the cable is bad.
Try the following solutions in the order presented to resolve the issue...

Solution one: Press and quickly release the Power button
Press and quickly release the Power button ( ) to start a Power On/Off cycle. Do not hold down the button .
Press and quickly release the Power button
If you press and hold the Power button too long, the product might turn on and then off without restarting. If this happens, press and quickly release the Power button ( ) again.
If these steps resolved the issue , you do not need to continue troubleshooting.
If the issue persists , continue to the next solution.
Solution two: Check the electrical connections and outlet
Unplug the power cord from the electrical outlet, or the power strip or surge suppressor.
NOTE: The power cord detaches from the power module. The term power supply refers to both the power module and the power cord.
Carefully inspect the power cord for visible damage.
If the power cord or power module shows any damage, contact HP to replace the power supply.
Disconnect the power supply from the back of the product.
Wait at least 30 seconds, and then plug the disconnected power supply into an electrical outlet. Do not use a power strip or surge suppressor.
If the green light (LED) on the power supply does not light up, contact HP to replace the power supply.
Reconnect the power module to the product.
Press and quickly release the Power button ( ) to turn the product on.
If the product still does not turn on, connect the product to an electrical outlet in another room, and then quickly press and release the Power button ( ) to turn on the product.
If the product turns on , the electrical outlet in the original room caused the issue.
If the product still does not turn on , continue with the next solution.
Solution three: Check the USB cable
Disconnect the USB cable from the back of the product.
http://h10025.www1.hp.com/ewfrf-JAVA/Doc/images/c01896072.gif( chek the figure)
Press the Power button ( ) to turn on the product.
If the product turns on with the USB cable disconnected , replace the USB cable.
If the product still does not turn on , continue to the next solution.
Solution four: Check the battery
If your HP product has a battery, follow these steps:
Check the battery light. If the light is red, recharge the battery.
If the battery light is still red after recharge, replace the battery.
http://h10025.www1.hp.com/ewfrf-JAVA/Doc/images/c01468528.jpg( chek the figure)
1 - Slide the battery release slider in the direction of the arrow
2 - Remove the battery
Instructions for recharging and replacing a battery are available on the HP Web site.
Solution five: Replace the power supply
If you have completed all of the troubleshooting steps and are still experiencing a problem, contact HP to replace the power supply for your product.
Solution six: Service the printer
If you have completed all the steps listed above and are still experiencing a problem, service the product.
Thanks for contacting fixya.com

if you replaced the supply board then there is issues with the decoder board as you would need to chec kthat and see if its not the issue.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620