MacBook Pro hard drive problems: Can it be hard drive cable?
The most overlooked part is the cable. i've worked in an Apple tech dept for the last 8-9 years and in the 13" MBP's i've seen Data cables/SATA cables go bad more often then the hard drive. could be from the thin factor of the drive or the drive itself causing the cable to short.

Best bet try the cable first before you mess with any data.