To start with, either remove the hard drive and slave it to another computer to copy the data off of it
or, use a bootable drive to boot into another OS and then copy the data to an external drive (may require disabling SecureBoot and enabling legacy/CSM).
Once that's done, start with these free, bootable diagnostics: http://www.carrona.org/initdiag.html
Again, you may have to disable SecureBoot and enable legacy/CSM in order to boot from the disks
For the hard drive diagnostics you'll have to either work on finding a bootable diagnostic for a USB drive - or test the drive when you slave it to a working computer.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
)**If you need a more detailed explanation, please ask for it. I have the Knack
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