My Mum's work was throwing away their old business laptops and my Mum decided to take one home instead. They wiped the computers completely, and I downloaded a windows 7 ISO but still no boot device is being found. The computer is set to complete default I haven't changed anything. My windows 7 disc could be the problem I'm well aware . Could anyone confirm or give me hints on to how I can get this laptop up and running? Maybe a cleaner version of windows 7 etc.
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Please boot into BIOS <F2> and check if hard drive is listed as the boot option.
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Here is what i get from Dell Latitude E6320 Manual. This helps to me when i also face similar issue as you. So i hope it helps you to.....
Try unplugging all the drives except the hard drive. Remove the cables from the hard drive and the sata connector from the mobo - and then plug them back in the hard drive only - try to see if the BIOS recognizes the drives. If not, replace the SATA cable with another one and try again.
Also - try a different sata port on the mobo.
If this doesn't work - there is a 99% chance you won't be able to do anything with the drive....it would need to go to a data recovery shop.