i am having the same problem cypher had in November last year. comp locks up in any 3d apps, windows, dos, and sometimes doesnt even post. The vid card is a 32meg TNT2 pro made by powercolor board model CTNT2SG versoin 1.1. My computer is a p2 233 on a tyan s1692d mobo with 64 meg o ram, running off a 250 watt power supply, I am running windows 98. Other cards include a cheap 10/100Mb network card and a sound balster 16. Plz reply if u know how to fix this problem