Random comupter restarts...

Could this be related to a generic psu? Still using the one that came with my case, and as time has gone on, the frequency in these just random restarts has risen. Could it be the psu? It's a Turbolink 420w.

edit: and on the topic of psu's, antec and enermax obviously. But how can you tell how much you need? 2 optical drives, fan controller, 4 case fans, 2100+, 2 lights. Would a 300w work?

IMHO I would get at least a 400 watt enermax/Antec- Nforce2 MBs seem to soak up a lot of power. I'm using an enermax 460W in my system without problems.

My turbolink 420w is doing ok, but that doesn't mean yours isn't giving you problems.

get a 350watt to 400watt antec. Beleive me. 350watts supports a hellava lot of hardware