Here is my problem, I have 2 Western Digital 1 TB Sata II drives. Call them Drive 1 and 2. I've been running Drive 1 since I put my computer together a year ago. So Drive 1 has the OS installed on it. A few months back I added Drive 2 and all has been running fine. Until a few days ago. I tried to turn on my computer in the morning and it wouldn't even get to the POST which means the BIOS sequence wouldn't even start. There was nothing on the monitor and since it didn't even get to the POST, the mouse and keyboard were not even active. So, I disconnected Drive 2 and my system booted up no problems. So to rule out bad cables, I tried 6 different sata cables and different ports but still no success to boot up my system while Drive 2 is connected. So I did something very risky. I booted up my system with only Drive 1 connected. So now while I have my system completely booted up, I connected Drive 2 (yes a big no no, but I was desperate), I then went into device manager and under Disk Drives I scanned for new hardware. All of a sudden Drive 2 was recognized and windows installed the drivers and all is working. I quickly grabbed my files from Drive 2 and safely put them on Drive 1. I even quickly ran LifeGuard from Western Digital and both Drives had a PASS for the SMART status. So I rebooted and the system would not boot up again because Drive 2 was connected. So again, I disconnected Drive 2 and the system booted up again no problem. I updated all sata and chipset drivers directly from ASUS and still no success. Does this mean that Drive 2 is bad. Now if my Drive 2 is bad, why does it work when I connect it while windows is booted up? Shouldn't a bad drive not work at all? Why would a bad (if it is bad) second Hard Drive that doesn't have the OS on it, cause a system from getting into the BIOS or even getting into the Boot sequence. Now when the system fails to boot, all fans are running and I can hear the Hard Drives spinning, and all lights are on, but the boot sequence just doesn't get going. Here is my system: Windows 7 Ultimate 64 Bit Intel Core 2 Due 3GHz 4GB RAM Asus P5Q MoBo 2 x Western Digital 1TB Caviar Black 7200rpm SATA II GeForce 9400 GT Video Card 600 Watt Power Supply Appreciate any insight regarding this.