I used to have this configuration: Motherboard: Ali M1621 Processor: Celeron 333MHz on Slot 1 Ram: 2*32 + 1*64 PC100 Video: GeForce2 MX 400 32Mb AGP Sound: Some Yamaha thingie on PCI Hard disk: Quantum Fireball 3.2Gb. Now, I have this: Motherboard: The same Processor Pentium III 450MHz on Slot 1 Ram: 1*128 PC133 Video: The same Sound: The same Hard disk: Quantum Fireball 3.2Gb + Quantum Fireball 5Gb. The problem (that seems to appear for random periods of time) is that in some 3d games and other 3d applications the computers locks up and usually the only thing I can do is press the reset button. However there are differences... in some games it locks only for about 10 seconds and then it starts moving again, in others I can use Ctrl+Alt+Del to close it and others simply stop responding for good. Also, it seems that this lock-up doesn't affect the sound because I can still hear the music in the game and other sounds... for example once it locked-up during a tutorial of a game and that guy kept talking while everything was frozen on the screen. I had this problem with my previous configuration and I have it with this one too, both on Win98 SE and Win2000. I tried both without the Yamaha sound card by using the on-board sound card and with no sound card at all. Now, since almost everything was changed (or not used) except for the motherboard and the video card, I assume the problem is somewhere around them, but I'm suspecting the video card since there are some weird issues with it, like: In Win2000 I have to use a very old Detonator driver because otherwise the monitor flickers (just like it does when you install Win2000) randomly. I tried the latest driver from the NVIDIA site and no luck. In Win98SE I can install any driver without problems, but on certain shades of grey some green dots appear. So... basically the question is: can it be something else and not the video card? The motherboard maybe? I don't know... but I think if the motherboard would be broken it would lock up completely... so no sound or Ctrl+Alt+Del still working.