|"I can't turn the computer back on for 10 minutes"|
There's a big clue right there. Something is overheating ( CPU or Graphics card) and your system won't restart until it cools down.
Have you cleaned out the heatsink & fan on the CPU? Download and install Speedfan so you can see what temperature your system is running.
As for the DVD misbehaving that may be a problem with that drive or it might be motherboard or possibly even a virus
Goin' Fishin' (Some day)