Ok, so my friend and i built his pc a year ago, it had it's we'll say "unique personality." It just got worse in the past month or so. His PSU died so right now he's power in the following:
Gigabyte ATX Mobo
ATI X1900XT w/256MB
2gb of RAM
Core 2 Duo @ 2.13ghz
250GB Western Digital Hard Drive
Happauge TV Tuner
Disc Dirve(there is no plug going to this so it is not on)

With a, i believe, 350 watt PSU. It didn't have enough cords to hook into his disc drive and now his computer suffers more of the following:
Game Crashes
Blue Screens while in game
Lag

Now, everyone's comp eventually finds that game that their comp doesn't like, we'll his computer hates all games now.
So i'm wondering, what's the best course of action for him:
New RAM?
New psu?
New Graphics Card