At on point (back in 1989), I had an old drive that would not spin-up when the others were because it had a build-up of lubricant that had stiffened when off after months of running. To get it to spin-up, I removed the power connector, powered up the computer, entering BIOS setup to prevent the booting, and after a minute connected the power connector to the drive. Since the other drivers were not requiring the start-up amperage, the drive managed to start-up. I exited the BIOS setup-up without saving and the machine came up. Copied my data to a new drive and removed the older drives. (I had one friend that suggested that I rap the drive with a screwdriver handle, which I did not do.) I have used the BIOS set-up boot delay another time when starting up a computer that had not been used for few years just to allow the drives to warm-up before booting.