T20 freezing, NOT a software problem

[Zak]

I recently replaced the system board in my T20 because it had a bad eeprom. Two days ago, it started freezing at random and requiring a hard shutdown to get it back up. After testing the memory and hard drive and finding no problems, I moved the memory, hard drive and wireless card to a 600X. The 600X has been running perfectly for the past 24 hours.

I'm not sure what to check, aside from inspecting the entire surface of the system board with a magnifying glass. I could just put the good eeprom on one of the two boards[0] I have with bad eeproms.

[0] The two boards came from separate computers - I don't just have a computer that's frying eeproms, I think.