System hangs and refuses to power up after reset. Pls Help!

My systems hangs after around an hour of gaming. After a hard reset, it doesn't power up. However, i'l be able to turn on the system again after a couple of hours. This started happening when i changed my harddisk from 500gb to 750gb.

Is this a cooling problem or power supply problem?

The following are some of my system specs.
- E8400
- Gigabyte ep45 ud3p
- gigabyte 9800GT
- Seagate barracuda 750gb 7200rpm SATA
- andyson 500W PSU
- CM Centurion casing

No overclocking done. Stock cooling. All help is greatly appreciated.
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