I was deeply involved in playing "Rise Of Nations" when suddenly the screen went black, the monitor even went into standby..could not get it started, no matter what button on the keyboard I pushed..or moved the mouse. The sound was still there. I hade to press the reset button, then it started like nothing had happened. In the logg file i got a Save Dump logging. Now, I do not have the the codes and numbers there, but it only said that "The computer has rebooted from a bugcheck" and "A dump was saved in: C:\xxxx...." and so on... I use Geforce FX 5600 Ultra 256 Mb @ 4x AGP. I use driver 44.03 downloaded from nVidia homepage. I use two 512 Mb PC2100 DDR memory sticks (Samsung CL2.5). There is only 2 slots for memory on my MoBo (max 1Gb per slot) DirectX 9.0b No OC'ing. Could it be something with the card, memory..or driver? Anyone have any idea.. or was it just one of those moments that can happen during gameplay...has not happened to me before. Thanks for the help!