[dai]

what
video card
cpu
m/board
power supply
brand
wattage
are you running
any error message
check your tempretures and voltages in the bios and post them

 

[dai]

reset the cmos
turn the computer off
remove the power lead from the back
take the side off
remove the cmos battery
move the cmos jumper from pins 1 and 2 to pin 2 and 3 and the back to pins 1 and 2
replace the battery
put the side on
replug in the power lead
boot the computer

there can be 2 solder points you touch with a screwdriver
2 pins you touch with a screwdriver or use a jumper
a cmos clear switch or button
there will be a diagram and instructions in your manual

look at the label on the side of the power supply for the details