Windows 7 Won't Boot Without 2 Hard Drives

This is weird, I have two hard drives (160GB and 120GB). I have Windows 7 installed on the 160GB hard drive, but as soon as I remove the 120GB extra, Windows 7 says it can't find the bootmgr (or ntloader, I can't remember). Either way, the computer REFUSES to boot without the second hard drive. There's literally nothing on that other hard drive except games.

I've switched jumpers as well, makes no difference.

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More about windows boot hard drives
  1. It means the MBR (Master Boot Record) has been installed on the 120Gig.

    This might help, depending on how the machine is configured...
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