is my geforce2 toasted?

I have an a-open ak-73 motherboard[via kt-133],running a duron 900,with 128 ram.hdd is maxtor ata 100 20g.the motherboard has onboard sound also.My video card is geforce2mx200 32mb.os is win 98.This setup seemed to work fine untill I installed mohaa.Now, the game still plays fine,but lots of strange colors and dots on screen that should’nt be there.I thought this was the game , but everygame I have does this now!!!My system only does this when I need 3d acceleration.2d games and desktop are fine.I don,t know what to do.I have the latest 28.32 nvidia drivers and directx8.Help!!!