Hey, first time poster here all. I apologize for that but maybe i'll stick around! Anyway, I thank you all for the help in advance if anyone can help me. ^^ Anyway, My old video card (AGP BFG Tech Nvidia GeForce 6600OC) pretty much blew up. Fan stopped working and boom. So i upgraded to a BFG Tech Nvidia GeForce 7800GSOC[Also AGP], and installed it and all was well. Well every now and then, when gaming i lag very badly; almost as if the video card is only running at 20% of its normal capabilities. The only way to fix this is by a reboot. So, i was thinking with my moderate knowledge of computers; maybe its the PSU! On the box it says a 400W Minimum power supply with a 20.0A +12V Rail minimum is required. My system spec's are as followed; Intel Pentium 4 Prescott 3.00GHz w/ Hyper-Threading 1GB(2x512) PC3200 RAM Intel D865GBF Motherboard 250GB 7200RPM ATA Western Digital Harddrive BFG Tech Nvidia GeForce 7800GSOC [AGP] SoundBlaster Audigy 4 Now as for the power supply; it came with the new fancy case i bought maybe 3 years ago. On the side of the case it says it's "400W MAX", and as far as rails go... +3.3V = 28.0A +5V = 30.0A +12V = 25.0A I've heard that power supplies that come with cases are usually bad news. Also, i know this might have something to do with it but my computer keeps trying to ChkDsk my second Physical Partition every time it boots up. But i could care less about that, unless of course it's causing the problem. So what do you all think the problem is; and what steps could i take to solve it? Thanks in advance!