help me determine the problem please!

[chudney]

sys info

IDE 40gb hdisk
ddr2 2gb 6400
amd athlon 64x dual core 4000+
built in VGA
500watts psu
jetway m26gt3-svp mobo

my problem is simple!

my computer doesn't POWER ON for a certain hour!

i got brand new psu installed
brand new RAM
the rest old stuff
help me determine what's causing it!
its frustrated...! help!

[2x3i5x]

you mean that your computer at specific times of the day, you can't power on your computer while it is fine otherwise?

[Geek-9pm]

Did you mean to say it only runs one hour? Are you using Windows 7 RC?
When did this star?
Hew often has this happened?
Where do you live? Are you on 120 volts or 240 volts? Are there scheduled "brown outs" in your area?
Are you the only administrator of the PC?
Have you don a virus scan lately?