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Computer will not swtch on.light just works etc.

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Check the backup battery

Posted on Oct 27, 2008

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First check the power supply cable to the motherboard remove it and then open the cpu unit remove the 20 or 24 pin power cable wait for 30 seconds and replace it after that try to start the pc

if it will not work the try to replace the powersupply unit wth a new one and see its switching on most of the time when peoples see those light and fan working they dont look back to the power supply.

Actually the power supply will switch through the motherboard if there is no proper voltage the motherboard will not function but you will see flashing lights and working fans.

After that you check with your VGA card and check for any cables are disconnected or not

If still it not working you need a techinican help.

Posted on Jul 18, 2008

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Posted on Jan 02, 2017

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Won't start up little green light flashing on back

the green light flashing on the backside is your internetconnection.
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How to troubleshoot an electrical brownout (computers)

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Dell Optiplex GX520 has flashing amber power light. Ordered another power supply & replaced, still flashing. No fans going. I disconnected USB cables and all other connections to MOB & removed...

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Hp pavilion a705w. no peripheral response

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When comp pluged in just a green flashing light

If you are sure that the 110 volt power is coming into the computer then the most likely problem is that th epower supply died. Obtain a new one of the same or larger wattagge as the one you are replacing . It does nto have to come from the manufacture of the computer. 

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Power Green Light Flashing HP Desk Top PC m7250n

During a power outage their is a surge when power come back on the grid (surge can be caused by lighting strikes akso). This surge trips the internal procters inside the power supply to protect the Mother Board, hard drive, processor and fans and any device that pulls wattage from the power supply. Since all these power using devices are trying to pull power at the same time to boot the computer back up one ends up with a loop of surge thrugh the power supply with a protective trip, reset, surge again and trip again. This will continue in this loop as the computer is trying to boot all the devices at one time (Mobo, Hd, processor, cooling fans and other devices). Simoly, more power wattage is being demanded than the protectors will allow at one time causing a protective shutdown followed by a restart followe by a protective shutdown in a continious loop.
The normall sequence for a boot is to boot the board, processor and fans followed by a boot of the hard drive, and other boot devices once the board is energised, NOT all devices at the same time, as this results in an overload and trips the protectors. This protective loop is indicated by the blinking light as the power is turned on and then shut down for protection as the wattage pull is over the demand that the protectors will allow.
Blinking light indictes you are in the protective loop.
SOLUTION: 1. Disconnect the Mother Board connector, with the computer unplugged, this will allow the power supply to reset at maximum wattage upon reboot.
2. Disconnect the Hard Drive power connector and ay boot device power supply cables, this will allow the Mother Board, processors and fans to boot without an overload of the protector inside the power supply.
3. Plug in the computer and the indicator light will be solid green indicating that it is reset and out of the loop.
4. With the computer pluged in and the Power Supply fully energised, plug in the Mother Board. The computer will now boot, and the processor fan will come on and the cooling fans.
5. After computer has rebooted, shut the computer back down and connect the Hard Drive power cable and any other power cablis that were unplugged.
6. Reboot with all cables connected and you are up and running again.


Hope this helps everone with power outages and lightining strikes. It is a rather common problem and can also occure when building a computer and one missmatches the power supply with the board wattage needs. If the board wattage needs are greater than the power supply output you will get stuck in a potective loop eventually. WHEN BUILDING A COMPUTER ALWAYS MAKE SURE THE POWER SUPPLY CAN PRODUCE MORE WATTAGE THAN YOU CAN CONSUME AT THE MAXAMUM LOAD.
Have a great computing experiense.

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If working OK, probably means that the temperature alarm goes off because is getting hot the PC. I suggest to check why is that happening. All fans working OK? is the CMOS temperature alarm set too low? check your motherboard instructions booklet- It will tell you what the beeps mean probably in the last pages. Good luck

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