If the drive is still not spinning, connect it in another computer if possible.Check the power supply on your computer to determine whether it is providing sufficient electrical power to operate the drives and devices you have in your computer.Switch power cables with a device like a CDROM or DVDROM drive so that you are using a known-good power cable.Then repeat, only reconnect the hard drive and listen for it to spin up.Boot the computer up to see if the drive sound was audible before.Reconnect the power cord to the computer itself.Disconnect the power cable from the hard drive in question.Disconnect the power cord from the computer itself.Boot the computer and listen carefully.If you cannot determine whether the drive is spinning: If you do not hear or feel the hard drive spinning, the drive did not start. If you touch the side of the drive you should feel a slight vibration. Check to see if the hard drive is spinning. This will stop any power saving commands from being sent. Open the computer case and remove the data cable from the hard drive.If the drive is not receiving power or receiving an incorrect level of power, it will not spin up. To check to see if this is the cause of the BIOS not detecting the hard drive, follow these steps: Note: These steps are NOT applicable for SSD drives. If you have received a SMART error, we strongly recommend that you stop everything and make an immediate backup of any and all important data contained on this drive that is not already backed up. If a "SMART error" has recently appeared on your computer, this generally means drive failure is imminent or has already occurred. One error in particular, however, is more important than others to watch out for. This set of troubleshooting steps will attempt to get the drive detected again, or to conclude whether the drive has failed and should be replaced. Instead, some error message will occur, and it will become obvious that a serious problem has occurred. So, if the computer suddenly stops detecting the bootable drive, this will almost certainly mean that the computer will fail to boot at all. It is the source of most of the computer's operations. Generally, if a SATA drive is configured as the bootable drive, then the computer relies on that drive to boot the computer and to launch Windows.
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