Is it a new blank drive?
Go into a command prompt (run "cmd") and run DISKPART. Input LIST DISKS and see if the HDD is offline.
If the drive is new, input SELECT DISK 1 (if that's it), and run CLEAN, and see if that does anything differnet when you do a LIST DISK again.
Then go back to Disk Management, and see if it automatically recongnizes it, to allocate it, create an MBR, and lets you partition and format it.