Hello. Yesterday, I spent a lot of time playing Battlefield 3. Oddly, my PC randomly just shut down without warning. It did this a few times, and each time I just turned it back on. However, the final time this happened, my PC started in POST saying "Primary Slave Hard Disk Error". I have heard a lot of possible explanations for this,but I was wondering if anyone could help. By the way, I have two hard drives, neither are detected in BIOS, even when plugged in very securely. If you need additional information, let me know and I can help you to help me! Thanks!