I have a External Seagate Momentus 5400.6 Hard Drive That I want to Install into my laptop and use as the primary

hard drive. I get the response ( No bootable device detected . . . ) yet the hard drive shows up in the bios and

looks to be fully working. The drive works just fine as an external drive. I have also put in a different hard

drive to make sure it wasn't my laptop. I was able to install the OS using my Reboot Disk. help?

Seagate momentus 5400.6 500 GB

Acer Aspire 5552-3691

Windows 7 Laptop

Old Drive: Western Digital WD2500BEVT Scorpio Blue