When I turn on my PC it says ‘Please restart and select proper boot device’!?

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This error means that for whatever reason your system doesn’t find the installed Windows. Which can be caused by two things, Windows (software) or the hard drive (hardware). To find out what exactly is happening we advise the following steps.
Turn the system off. Wait a few seconds.
Turn it back on and immediately and continuously tap the F8 button if you have an Asus motherboard. Use the F12 button if it’s a Gigabyte motherboard instead. (Or F7 if this happens with your laptop).
This looks most likely like this:

Select your boot drive (assuming it appears at all) and see if it boots into Windows at all. If so, the boot option could be wrong and we can go into BIOS together to get that sorted. Give us a ring and we’ll talk you through it.

If your C: drive isn’t listed there it could mean that Windows isn’t bootable, maybe an Update has corrupted the files. The easiest at this point would be a reinstall of Windows, but that wipes your hard drive and you will lose all the data on your C: drive. Therefore, most people prefer to try and restore Windows first, hopefully you have a repair point before the corruption happened and you won’t lose your files.
But, if there is hard drive point, it could also mean that the hard drive itself has developed a hard ware fault, which is a bit difficult to detect. If you moved your PC around, maybe a cable has come loose, that would be one way to just try and see if it helps. If not, give us a ring and we’ll see if we can replace the hard drive or not.

Please be advised that we don’t do Data rescue at PCS, if we exchange a hard drive the data on the old one will be lost and we can’t get to it!
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