A computer is showing the “No boot device found” message even though a technician has verified
that the hard drive is set as Device 1 in the BIOS boot order. Which of the following causes is
MOST likely at play?

A.
A 40-pin cable was used instead of an 80-pin cable to connect the HDD.

B.
The hard drive is disconnected.

C.
The hard drive has corrupted sectors and needs a CHKDSK scan.

D.
Both PATA devices are incorrectly set to the master jumper setting.

Explanation:
http://wdc.custhelp.com/app/answers/detail/a_id/981/~/how-to-physically-install,-setjumper-settings,-and-set-up-a-serial-ata,-eide,