AU3 Falcon XR8 Ute (auto)
Join Date: Nov 2002
Location: NT, Australia
Re: Computer GURUS ..... HELP!!!!!!
First I'd eliminate it as a software problem so you can confirm if it's definatley hardware to look at then.
Set a bios password and just boot the computer up to the bios password prompt and leave it sit there for a while and see if it still shuts down. A less-ideal way to do this would be just to boot Windows (which it sounds like you're running) into a safe, command-line only mode and leave it there. If you don't get shut-downs then it's a software issue. My reccomendation would be to ditch Windows and run Linux, but not everyone is receptive to my ideas lol. Else, look at Windows power management settings or any updates for Windows and/or your bios which may affect the Windows<>BIOS APM/ACPI interface etc. Check for wierd power maganement settings in the BIOS too - turn PM completely off in BIOS and Windows if in doubt as it can be more trouble than it's worth. It could also be a virus/trojan or whatever else that you just can't detect.
If it's definatley hardware, the first thing I'd check is maybe monitor your 240v outlet with a multimeter while the computer's running to ensure no power glitches (if you have a suitable multimeter etc.) - then look to maybe replacing your computers power supply (try one first before you buy one to make sure that's the problem if possible). If you do buy a power supply, get a top-quality brand-name one. Some cheaper and/or generic PSUs are known to have a dodgey power-good signal - they just bridge the PG wire to a constant +5v wire and that can cause many intermittant probs etc. maybe similar to yours.
Maybe not much help, but best I could do without seeing/testing the machine or knowing more details - I do offer Australia-wide on-site support though as long as the customer pays travel costs :)