Hard drive controller problem
S.M.A.R.T (system monitoring)is the warning software that detects when a hard drive is about to fail, so i would back up any important docs to a disc or usb drive immediately and replace the hard drive.
The hard drive controller itself will not be the problem, it's the controller saying that the problem is the drive, the controller is only a driver and not a peice of hardware, pressing F1 will ignore any faults and continue to boot, but especially if it doesnt always boot it's definately your hard drive.
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