Question about HP Pavilion 754n PC Desktop

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No power will not turn on monitor or key board

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  • jwpp May 03, 2008

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Have you plugged both of these into the back of the tower? Ensure the keyboard is in the appropriate plug-in, and the monitor's power cord is plugged into both the wall and the monitor itself.

Posted on May 04, 2008

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1 Answer

Computer powers up, MONITOR says no signal


had same problem...re-install windows ...bad drivers and such
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Tip

How To Repair LCD Monitor


The most common problems on Samsung LCD monitor/TV:
  • The power can not turn on, the red light flashing
  • the monitor on for a while and then turn off, then the red light flashing.
This is due to the weakening of the capacitor in the power supply module.
let's go hunting for bad capacitor.


I will explain how to:

  • Open the case of the LCD
basically in all LCD monitors have two circuit boards (power supply board and system board)
  • After you open you will see the two boards are
  • You see a board that has a socket for the power source. wrote that the board we're looking for (power supply board)
  • Remove all cables connected to the board and take out the board. (get noted before you unplug it)
  • Now you see it components on board, we looking for capacitor.(see picture below)
8644481.jpg
  • Looking for damaged capacitors, physically you will see a capacitor on the top like a bloated (see picture below)
a1611e3.jpg
  • Replace the damaged capacitor with the same value that you can see on the surface of the capacitor. (In this step you need any soldering tool)
My advice: replace capacitors with higher voltage, like 10V replace with 16V or 25V will be fine.

Have a Nice Repair :)

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1 Answer

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I think the issue is your monitor. If the monitor constantly says Power Save Mode and not let anything else display then the monitor might be bad. See if we can isolate the problem by the steps below.

Try booting up in Safe Mode and see if the monitor works ok.

Turn off the computer, then hit the power button to turn it back on and immediately start hitting the F8 key repeatedly until you see SAFE MODE. Take the Safe Mode option and let it boot up. Safe Mode will look different to you, the screen will be darker and the icons bigger, this is normal. If it works ok in safe mode then the monitor is ok and we might have an issue with a setting.


Try connecting another monitor to your computer. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor works ok, then your original monitor is bad. If the Borrowed monitor does the same thing as your original monitor then the issue is with the computer (possibly the video card).

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The graphics card in the PC is very likely faulty. It is possible to remove the graphics card and reconnect the monitor cable to the onboard graphics. Look on youtube for help on removing the graphics card (try a search for iq772). The monitor connector is at the front of the motherboard, near to the graphics card. re-connect it to a similar connector to the left to use the on-board graphics.

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1 Answer

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I have to assume you get a power light on the monitor. If possible hook the monitor up to a different PC. If it works the problem is in the PC not the monitor. If not then the monitor is at fault. If the monitor see if there is an image on the screen by shining a flashlight on the face. If there is an image then the backlighting has failed. On desktop monitors it is usually the power board that lights the CCFL backlight lamps and it could be as simple as failed electrolytic capacitors that have swollen and failed. If so you could replace the capacitors or replace the whole power board. Of course most people opt to replace the monitor as a whole. If the monitor works fine then the video section is at fault. If it has a plugin video board then check to see if it's fully seated in the slot. If the video is integrated on the motherboard then motherboard replacement is needed.

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When i turn on my pc i hear a noise but in my screen i don't see nothing


Do you see any activity from the hard drive lights or do you hear a single beep from the computer speaker? If yes do you have an flat screen or a CRT monitor and do you have a power on LED illuminated on the monitor? Can you see any output accessing the menu mode of the monitor? If yes check your cable from the monitor to video card to make sure it is plugged in. If no it could be your monitor or video card and you will need to test the monitor on another system. If you press the power key once for a second will the computer immediately shut off? if yes the problem could be the mother board or power supply. You need to test the power supply if it is good suspect mother board or CPU. If the system shuts down within a minute then test the video card.

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Compaq Presario v5000 desktop


Is there a power switch on the back of the power supply which is not on? Make sure the power cord is good and plugged into a good power source. Do the fans run inside the system? Is the fan for the power supply working? If not the power supply could be bad. You can purchase a power supply tester to plug the mother board connector into to verify the operation for about $15.00. Do you see any lights on the mother board and the Hard Drive light flickering? If you do and your Key Board lights are on your video controller or monitor could be setup wrong or defective. If the power supply tests good then you need to test the memory and CPU. You could also carefully remove all boards except the video card, mother board and memory and see if it boots up.

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2 Answers

What would cause the monitor to show safe mode?


when you press all keys of key board or when you press unwantedly
from nischal
nisc

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