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Why won't my PC start up?

By dysonsphere ·
Hi,

This is my first post.

Recently I have been having trouble when starting up my PC.

When I press the power button it would light up, the fans would start up, and then in a few seconds the whole thing would power down before anything shows on the screen, then on its own it would run through the same cycle over and over again, powering up and down until I turned off the PSU.

I did a google search and found advice to disconnect everything, reconnect it, and clear the cmos either by removing the MOBO battery or changing the pins on the reset cmos. I did all that and it started up again.

I had the PC on overnight and when I returned to it the screen was blank (power saving mode), but I could not get the monitor to respond as the mouse and keyboard where unresponsive.

I powered down manually and then it would not start again. I ran through what I did previously, but this time it did not work.

I tried disconnecting the HDD's and the CD ROM drive and power on to BIOS. This worked. Then reconnected all the drives and it powered up just fine. I am using it now.

I am perplexed as to why it works some times and not others. Could it be the MOBO or the PSU?

I am, dual booting Ubuntu and XP. It loads to GRUB.

Thanks in advance.

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Possible solutions

by ctmoore1998 In reply to Why won't my PC start up?

It could be the PS or an intermittent voltage reg on MB or Mem DIMM. 1st if you MB allows remove memory so that you only have 1 DIMM installed (some MB require them to be installed in pairs however) If problem persists, try another PS. If neither of those remedy issue it is likely the voltage reg on MB.

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As stated above it's either a Failing PS

by OH Smeg In reply to Why won't my PC start up?

Or a Failing Cap on the M'Board.

Either way to test you need to remove the Mains Lead from the case and push the Power On Button for 30 Seconds to discharge the Capacitors and then after that is finished replace the Mains Lead and try turning on again.

if it works now I would be looking at a Failing Power Supply as the most obvious thing.

Col

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Power off, mains lead

by BigJohnLg In reply to As stated above it's eith ...

If confusion exists, he means Pull the power cord from the unit and turn on the power switch for 30 seconds or so. That will or should drain all stored power in the capacitors throughout the unit.
Just for the **** of it, check your cpu fan and heat sink.

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