I've just put together a new PC (on a very tight budget) but it works (sort off). Bascially when playing games such as Day of Defeat source the computer freezes and needs a hard reset. I thought the issue was just DoD related but I've just reinstalled GTL and the same problem occurs on that as well. The lockup's appear to be for no apparent reason and occur at random times. It's just clicked with me that it could be a problem with the PSU not being powerful enough, could this be the cause? Setup is: Abit UL8 Motherboard* AMD 3500+ (64bit) Ati 9800se (upgrade in the post)* 1gb Samsung RAM *Both with latest drivers etc. It's not overclocked at all by the way.