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A personal computer that resides in one location with its core components inside a case separate to third-party peripherals required for operation, such as a mouse, keyboard, and monitor.

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no signal from monitor

hello, so, recently, my extension cord came out of the wall plug and obviously my pc did not turn on, however, when i plugged it in and turned it on, the fans and the lights on the fans and the light on my keyboard and mouse turned on. i tried different outputs with different ports and i also tried a different gpu. i also took one ram stick out and turned it on with a single ram stick, and i also took the other ram stick and put it in instead of the first one. i cleaned the ram sticks and even the slots and after all of this still no output. at this point, its either the cpu or the motherboard, how will i know which one it is?

it was working one moment, and than it doesnt work. pressing num lock or caps does make those lights on the keyboard turn on, so the system is active


My specs are :

AMD FX-6350

GTX 960M 2GB MSI

8-GB DDR3 RAM

460W CORSAIR PSU

1TB SAMSUNG SSD

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If the fans and keyboard and mouse (assuming they are plugged into the pc and not external power) are all working, the motherboard is at least getting and distributing power to some extent. If there's any onboard graphics I would leave out the GPU just to simplify troubleshooting. You need a multimeter to figure out where the issue is between motherboard and CPU, but I think there’s also a chance that your RAM sticks got zapped (have any known working others you can test?).

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i already tried a different ramk stick that i knew worked and it still didnt solve the problem. basically i narrowed it down to motherboard or cpu. when i press caps and tabs on my keyboard it lights up so there is pc activity, which makes me think it cant be a cpu related issue

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Hi @fre3b0rn ,

What is the make and model number of the motherboard?

Two things to try:

i). Try a full power refresh to restore the BIOS back to default values in case it became corrupted and prevents a normal start.

Here’s the procedure -

Turn off the desktop if on and then disconnect the power from the PSU.

Remove the coin cell battery from the motherboard (Note the orientation of the battery. It is usually +ve on top)

(While you have the coin cell battery out, check its voltage. If it is <2.5V DC replace it. The type number is stamped on the battery. Mostly they are a CR2032 but check anyway)

Press and hold the Power On button for a full 15 seconds and then release.

Reinsert the coin cell battery

Reconnect the power to the PSU and turn on the computer and check.

ii). If a power refresh doesn’t work check in the motherboard’s user manual for the header pin location for the system speaker connection. This is so that you can connect a system speaker (image) and check for any beep error codes that may sound after turning on the computer.

The manual should tell you what BIOS is installed, AMI, Phoenix, Award etc so you will have to look up what the codes mean to find out what is wrong.

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(click on image to enlarge for better viewing)

iii). If still no good try the paperclip test on the PSU and measure all the voltages to make sure that they’re OK. If they’re all OK then it is a motherboard problem. It may be the CPU as the BIOS starts the process not the CPU

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