HDDs are not forever devices. One glitch and you are reaching for your backup, restore and recovery systems. OS upgrades do stress machines but not one machine at office or home lost a HDD or OS over the past 2 years (that's hundreds of upgrades!)
-> Try this. Power off, remove power and open up this PC. Unplug the SATA and power cables (both ends) and plug them back in. Gently push them firmly home.
If the BIOS does not show a HDD, there is a HDD or SATA port issue. Windows does not currently destroy or kill HDDs.
After I upgraded Windows Technical Preview, which is running in dual-boot alongside Windows 8.1, my computer turned off. When I turn it back on, the BIOS asks which hard drive to use but there aren't any listed apart from the CD-Drive???
Help,
DavilBac

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