No reaction on powering on PC

March 8, 2011 at 18:37:12
Specs: Windows 7
I recently started having problems turning on my PC after having its extension cord unplugged. I would try to turn it on without any reaction, come back after a few minutes and try again and with some random delay of a few seconds it would turn on, often while not actually pressing the button.

When I did not unplug the PC, it seemed to be fine - until today:

My PC does not turn on anymore at all. No fans, no beep, nothing. However, the little green LED on the mainboard is on when the PC is plugged in.

I have unplugged all unnecessary components and manually bridged the power on pins (to make sure its not the power switch), no change.

What should I replace? The fact that it started happening whenever my PC was completely disconnected from the power supply made me thing it could be the CMOS battery, but replacing it didn't change anything.

The computer is about 4 years old, so I would next replace the PSU, or could it be the motherboard? Are there any other components that could cause such an issue?

Thank you for your help!

I built the computer myself 4 years ago, the components are:

Mainboard: Asus P5W DH Deluxe
PSU: Be quiet! BQT-ES-550W
CPU: Intel Core 2 Duo E6600 2.4Ghz
Graphics Card: Gainward GTS 250
Sound Card: Creative X-Fi Extreme Music (took it out as it recently stopped working - unrecognized device...)

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March 8, 2011 at 18:47:46
Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard.

The specific model of a brand name system is often shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site and loading a program they have available, if Windows is still working, on the subject computer.

If it's a Dell computer...
Go here for how to find the Service tag "number":

Tell us what it is.

If it's a HP or Compaq computer.....
Go here:
Scroll down a bit.
Look for the similar label on the outside of your computer.
Quote the specific model number - that's at the end of the first line.
Quote the Product number - that's on the third line.

The model, sometimes the make, of a mboard in a generic desktop system is usually printed on the mboard's surface in obvious larger characters, often between the slots.

See response 1:

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March 8, 2011 at 18:54:43
I updated my post with the components.

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March 8, 2011 at 19:03:32
I would tend to think you have either a failing power supply or failed out board, A power supply is pretty cheap fix, the board would not be so friendly. The power supply can be tested with a multimeter to make sure you have steady power at the different voltages, but it does test packaged good counts etc so its best to have it tested with a power supply tester.

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Related Solutions

March 8, 2011 at 20:36:53
See the link at the end of response 1 .

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March 13, 2011 at 16:08:22
I replaced the PSU, which SOLVED the issue. Thank you for your help!

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March 13, 2011 at 17:00:05
Thanks for the thank you.

Failing or dead power supplies are common.

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