I’m trying to transfer files from a phone to my computer but Bluetooth connection keeps failing. Why won't it stay connected?

Why won't my device power on?

Why does my volume down button dim my screen and my Windows key not work at all?

The best way to do the factory reset is recovering from the hard drive during startup, and you need to make sure that your file is saved before doing the factory reset. When you turn on the device, press <Alt> + <F10>, a screen will appear to ask some options, just choose the Troubleshoot, and then click Reset your PC.