I restarted my computer today and I got a message to "insert the proper boot disk". I tried the following without success:
Turned off unplugged rebooted.
Inserted Windows 7 Pro 64 bit install disk and tried repair startup - no operating system was found - repair was unsuccessful - tried checking memory but got a message sayin it could not be checked.
Moved the HDD to a different computer - it booted to the starting windows screen - it didn't continue to boot presumably because the hardware is completely different - however it did find the operating system.
Performed check disk on the drive and found no errors.
Tried booting from a previous system drive that was cloned to increase the size of the system drive. Same failure to boot.
The PC keyboard stopped working and prevented access to the BIOS. Substituted USB keyboard and regained access. System drive is recognized by the BIOS but does not appear on the list of boot devices.
System is custom built with the following:
i5 Asus P7P55D-E Premium MB
8 GB RAM
WB 1TB 7200 System Drive
1.5 TB Data Drive