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Could be an interrupt conflict.
I had one of those once. The video card and something else were fighting over an interrupt and the computer would instantly shut off.
I assume you have tried alternate bootups. Someone above suggested with a floppy - do try that.
Also, try booting up while holding the F4 key. That will dump you into the BIOS config area before the OS cranks up where you can putz with the settings.
Seems that its happening too fast to be an interrupt thing but you never know. Also, consider not turning it off. I never turn mine off.
I also wonder if you have a bad power switch.
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