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#11
Can you plug back in the other HD to boot Win7 so you can post back the screenshot of Disk Management - Post a Screen Capture Image which will tell us what we need to know? Make sure the 250gb HD is set first to boot in BIOS setup when you do this.
If not unplug all other HD's, boot into System Recovery Options on the Win7 DVD or System Repair Disk to confirm that the Win7 partition or it's 100mb SYstem Reserved partition (preferred if you have it) is Partition Marked Active.
Then close the Command Box, return to Recovery Options to run Startup Repair - Run up to 3 Separate Times until Win7 starts.
The Win7 installer is available in Step 5 of Troubleshooting Windows 7 Failure to Start which also links to the Partition Wizard boot disk which can provide a disk map so you can see what you're doing to Mark Partition Active, post back a camera snap of the full drive map and listings for us to help better.