Solved Bios doesn't start

May 23, 2011 at 14:56:42
Specs: Windows 7/XP, AMD Phenom II/8MB DDR2
Two days ago I was using Windows 7 on my 2+ year old home brew computer. It has both XP and W7, and when I was done with the task on W7, I tried to restart so I could use XP. The shutdown seemed normal, but I never got to boot XP. After the shutdown stage finished, the computer was still on, but no sign of the BIOS, detection of drives, etc. Nothing but a blank screen. I never even got the inital "beep"from the BIOS.

I assumed shutting off the computer and restarting it would straighten it out. Wrong! The computer seemed to start, but again there was no display, no "beep" and no BIOS. The power LED lights, and if I press the power button again, I have to hold it in for the usual 5 seconds or so before the power shuts off.

The RAM consists of four 2GB sticks. I have tried removing half of them at a time, and using different slots, with no change in the symptoms.

I have tried a different video card, with no change.

I have verified the CMOS battery is good.

I have measured the voltages from the PSU, and all appear normal.

I have replaced the CPU (AMD Phenom II) with the first generation Phenom, again no joy.

I have disconnected all internal optical and hard drives. No help.

The only thing else I can think of is replacing the motherboard, but I'm open to other less drastic suggestions. In other words, HELP!


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May 23, 2011 at 15:59:34
I would suspect the power supply. Voltages might be ok, but Amps are what matters. if you have an old one lying around try it. If not, check your local computer supply shops for a used one you can try.

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May 24, 2011 at 07:56:56
Thanks Grasshopper, I'll give this some thought. The power supply is 880 watts, has never been loaded near that, and there was no indication of failure, like bad smell or noise. Unfortunately I don't have a spare on hand, though getting a new one might be worthwhile, so I'll probably order one.

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June 2, 2011 at 13:17:49
✔ Best Answer
Got a new motherboard and PSU. The motherboard arrived first so I installed it, and that fixed the problem. None of the other components (drives, RAM etc.) have any problems. So I now have a new PSU as a spare, in case I ever need one. Problem solved, though no idea why the failure happened just at restart. As a retired minicomputer tech, I know computers can be strange.


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