|"Do may not even have a boot manager with only one OS." - not sure what this means?|
But, my computer starts up as long as the other 3 internal hard drives aren't plugged in. Only the C drive can be plugged in, along with the other 11 external hard drives. But, even with this setup, it starts up and if I try to play a movie in Windows Media Center from one oft he drives, it freezes up WMC and then the screen just goes black, nothing on it except for the mouse pointer, which I can move around. CTRL+ALT+DLT does nothing. This is the same setup I had in a different room and didn't have any issues with it until I moved it. It also takes about 15 minutes for the computer to recognize all of the external drives after it boots up. It will recognize a couple and then the other slowly trickle in to My Computer while they are all automatically in DEVICES.