|Are all the fans spinning after turning it on?|
- If no fans spin, try another power supply.
If they do turn on, do they turn off after a while?
Try to reseat all the RAM memory cards (take them out and reinsert them).
- try different RAM
Remove the CMOS battery (silver button battery) and reinsert it.
- This resets BIOS settings
Make sure that the 24-pin and 4-pin power supply cables are connected to the motherboard (common mistake).
- Disconnect and reconnect them
If you know the power supply is good and the RAM memory is good, then most likely its the motherboard that is bad.
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