Will only boot after shutdwn by removing CMOS

November 29, 2011 at 21:05:11
Specs: Windows XP, 1.6 Ghz 768 Ram
System is an Intel Desktop Board D845GBV (system build) running 1.7 Celeron GHz processor with a 512 and 256 stick of ram. System worked fine in the past until I had a hard drive crash and I switched over to another system. Since then the hard drive has been replaced with a fresh copy of XP Home and upgraded to service pack 3.

Now for the problem. I can restart the system or turn it off by either the power button on the back of the power supply or simply unplugging it but if I select “Turn off computer” it will not restart unless I remove the CMOS battery for 20 seconds. No fans, no power supply fan, nothing. The LED on the motherboard remains lit and I checked the power switch on the front of the system and it is working fine. If I try to jump the pins the power switch is attached to it still will not start.

I have tried a different power supply, different memory, have disconnected all drives and still the same problem. As I said before, if I remove the CMOS battery for 20 seconds and put it back in or start it up without the CMOS battery in it (after 20 seconds) it will again boot normally. Weird!

I did flash the BIOS with the latest version with no problems (Why? Just because. It may have been a mistake huh)? I have Google’d the problem and have seen numerous other similar posts but no answers so I thought I’d post here. Suggestions please?

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December 2, 2011 at 06:38:04
Fit a new CMOS battery.

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December 2, 2011 at 06:46:17
what settings, if any, are you setting in the bios?

does sound like that flash was not a good thing to do

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December 2, 2011 at 08:07:46
Sorry, I neglected to say I did fit a new CMOS battery. As for the BIOS, I've tried optimum values (the default) to no avail. Do you think it's time to remove the BIOS jumper and flash it back to it's original settings?

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December 2, 2011 at 08:27:27
When you fitted the new battery did you go into the BIOS and reset ans SAVE the BIOS settings.

Just fitting the battery and not doing anything else and the CMOS is likely to all kinds of random data in it.

Without the battery the CMOS is dead and the BIOS will just use its defaults.


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