Hard disk controller failure
Caution: When inside a computer, ensure you are familiar with ESD and take the necessary steps to help prevent it.
Hard drive not connected properly
Verify that the cables are properly connected to the back of the hard drive. All hard drives have at least two cables connected to the back of the drive. Verify that the power cable is connected as well as the Interface cable. Note: the interface cable must also be connected in the correct direction. Users who have IDE/EIDE hard drives, pin one (red or blue edge of the cable) will usually point towards the power connection.
Next, verify that the interface cable is properly connected to the interface card or motherboard.
Note: if the cables appear to be connected properly, consider disconnecting and then reconnecting the cables to ensure they are firmly connected.
Hard drive not setup properly
If a new IDE or EIDE device has been connected to the computer, ensure that the jumpers are set properly.
Verify that the computer hard drive is being properly detected and setup in CMOS setup. If your CMOS supports "Auto", it is recommended that it be used. Note: if the hard drive is not being detected by the CMOS it is possible that one of the reasons below may be occurring.
Bad hard drive cable
If the above recommendations have been attempted and you are still encountering the same issue, it is possible that the cable connecting the hard drive may be bad. Replace this cable with a known good cable.
Bad hard drive
If you continue to experience the same issues, it is possible that the hard drive may be bad. We recommend that the drive be replaced. If the computer or hard drive is still under warranty it is recommended you contact the manufacturer of the hard drive or the computer for additional recommendations or replacement.
Bad interface board or motherboard
Finally, if none of the above recommendations resolve your issue, unfortunately it is likely that the interface board the hard drive connects to or the motherboard is bad. It is recommended that these components be replaced or that the computer be serviced.
If the computer or motherboard is still under warranty it is recommended you contact the manufacturer of the motherboard or interface card or the computer for additional recommendations or replacement.