Wouldn't even have a display as the 2600 has no iGPU.also just check if you connected the hdmi/or your display cable to the motherboard instead to the gpu
oh i didnt saw it was the 2600 maybe check another game like a recent game since i see this one is from 2004 if this is realy a gpu problem then then your tests wouldnt even get 10fps in a new games go and test on newer games and lets see whats the fps
My gpu is geforce gtx 1060 aero itx 6g oc u think this is the problem coz i changed everything except the gpu i tgought this is still a good one. And same issue didnt fix the fps problem to my game lolif other games are good then probaly issue with the gpu since that game is very old it may have missing drivers or such.. but nah 350w its about your gpu not psu and if you have 350w psu that means you have a gpu that is more then capable of running 2004 game