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I have an Asus P4T533 mobo and I've set up the bios to be able to power-up
using the spacebar on my keyboard or the mouse button. It was working fine
up until recently when it stopped working completely. I reformatted my hard
drives and now it work half the time. I can not tell what is causing it to
not work the other half of the time. Just when I think I have it, it proves
wrong. It seems random as to when it will work and when it won't. I haven't
added any new hardware, so I'm completely stumped. Can you help me please?

My system:
Asus P4T533
256mb ram
128mb Gainward 4200
WD raid 160Gig
Leadtek WinTV 2000
Cooler Express ATX case
Enermax 450w PSU
Sony DVD-RW
Windows XP Pro w/ all updates