Hi there. I recently upgraded my system from a P2 450 to a Thunderbird 1300. I purchased with the Thunderbird CPU, a Jetway Motherboard, 256 meg RAM, a Pioneer 16x DVD drive, and a compatable case. The cooling fan and power supply fan are the only fans inside the system. I used my Hard Drive, CD-Writer, Sound Card, and Video Card from my other system. Everything was looking fine.. 10 minutes after the system started up the computer halted. Now, when I play a game the system halts (Often switches to a black screen) but music still plays. When reading from either of my CD Drives the computer often halts. Those are the most common crashes, but the computer also crashes while sitting in Windows. Any help will be much appreciated, thanks.