The acer aspire 5742-6858, intel core i5, 15.6″ LED LCD, 6 GB RAM and 640GB hard laptop was not booting up properly.
In this case we diagnose hard drive first which was okay.So we assumed windows has problems.Fortunately, our client didn’t have any important data and the hard drive had an original recovery partition.
For this acer we turned on the computer and pressed F8 three times and it went to recovery option that takes a couple of hours to get factory image windows.
We downloaded all microsoft windows updates and installed all necessary software.