hi guys, I have AMD-64 processor 80 GB SATA harddisk, 20 GB Serial ATA harddisk 512 MB DDR2 ram Motherboard is ASUS K8S-MX. Now, the problem is that My system reastarts abruptly while I am doing any work like AUTOCAD or playing games like NFSU2. Even while browsing the net it restarts. I have checked my CPU temperatures but found them normal. I have also flashed my motherboard but still the problem persists. One thing I doubt that while I start my system the BIOS displays the messsage "primary master drive - ATAPI incompatible" "press F1 to continue" Please Please Please help me. My only hope is you people.