No OS Installed?

Custom build, worked great and no problems until this happened:
Startup Repair automatically comes up. Results in: "Startup Repair cannot repair this computer automatically."
Problem SIgnature:
Problem Event name: Startuprepairoffline
P.S. 01: 6.1.7600.16385
P.S. 02: same as 1
P.S. 03: Unknown
P.S. 04: 56
P.S. 05: AutoFailover
P.S. 06: 1
P.S. 07: NoOsInstalled
Os Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033

After startup repair tells me under diagnosis and repair details:
Root cause found:
no OS files found on disk.

Repair action: Partition table repair
Result: Failed. Error code = 0X490
Time Taken = 312332ms

Does this mean the hard drive has crashed?

Tried a system restore and that failed.
Thank you for your help.