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First - re-seat the harddisk and reboot the computer. If the computer does not boot up then reboot andgo into the BIOS configuration to see if the BIOS detects the hard drive. If itdoesn't detect the hard drive then it could be faulty.Then the hard drive needsto be replaced in the computer/laptop, Windows installed and the computer orlaptop's device drivers plus your programs etc. to get a functioningcomputer/laptop again.
connecting the hard drive to an USB hard drive adapter and
connect it to a computer's USB port. The computer should see it as an
external storage device and you can open the various folders and files
to backup your data. If the computer cannot detect the hard drive as an external device then the hard drive is faulty. If
the hard drive makes a clicking noisy then it is definitely faulty and
replacing the circuit board cannot fix this problem. There are companies that can retrieve data from a faulty hard disk BUT it will cost you an arm and a leg for their services.
If the BIOS cannot detect the hard disk then probably the hard disk is faulty.
To check if the hard disk is faulty, remove the hard disk and connect it to an USB hard drive adapter and connect it to a working computer's USB port. If this computer cannot detect the hard drive or open the folders and files, then the hard disk is faulty.
To get your computer operating again, replace the hard drive with a new one and install Windows on the new hard drive plus the computer's device drivers and your programs.
It sounds to me that someone has passworded the hard drive. If you do not know the password, there is no way to access the hard drive. The two options in this case are get the password from whoever put it on or uy a new harddrive. People usually password their harddrive in case it is stolen or lost, then nobody can read thei data or use their computer.
If the laptop cannot detect the hard drive. This can be caused by a faulty disk controller, or a faulty disk drive.
1st. Reseat the hard drive and see if the laptop boots up.
2nd. Go into the BIOS configuration and see if the BIOS detects the hard drive.
3rd. If the BIOS can't detect the hard disk, the remove the hard drive and connect it to an USB hard drive adapter and plug it into a working computer's USB port. If this computer detects this drive as an external disk drive and you can see the contents of the hard drive, then the hard drive is OK and the fault is in the laptop.
4th. If the hard drive cannot be detected then the hard drive is faulty, you need to replace the faulty hard drive in your laptop and install Windows to get an operating laptop again.