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.

Thanks
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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...
    http://support.microsoft.com/kb/927392
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