While working on your computer, you receive the POST error, "Drive Not Recognized." You check your SATA cable to see if it is the problem, and it tests fine. You remove the hard drive and test it in a computer system known to be in good working condition and find that the hard drive is working. You can move data and check to make sure the OS files are not corrupt. You use a power supply tester to see if the voltage for the SATA power connection is correct, and the test shows the power is correct. You even check BIOS to make sure the hard drive can be recognized and find that all settings in BIOS are at default, so the system should recognize the hard drive. What might be the problem with your hard drive system? a$.$ Computer virus has deleted your MBR$.$ b$.$ Motherboard SATA port has gone bad. c$.$ UEFI has the wrong hard drive type. d$.$ Hard drive jumpers are in wrong place.