I have a dell xps 15 z which is 5 years old. It suddenly stopped working so i diagonised the problem and its showing hard drive test fail error 2000:0142 status 79. Please help
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The harddrive needs to be replaced.
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Since it is 5 years old the computer is out of warranty and you need to replace the hard drive yourself. See the service manual for how to do it. You will need windows installation disk. Windows install media is available here--
Replace the hard drive with a Solid State Drive. Then Download a Windows 10 TH2 .iso and Clean Install.