Originally published at: http://www.howtogeek.com/167094/how-to-use-the-windows-device-manager-for-troubleshooting/
The Windows Device Manager is an important troubleshooting tool. It displays all your installed hardware devices and allows you to view which ones have problems, manage their drivers, and even disable specific pieces of hardware.
One trick with hardware that is misbehaving is to Uninstall it in Device Manager, leave it plugged in and reboot. It is particularly good for recalcitrant DVD drives that I seem to be cursed with.
Oh, and Winkey + dev m opens it in W7.
Great. Now everyone knows how I fixed the fluctuating trackpad...
What about "scan for hardware changes" ?
What is the "dev m" key?
That would be six keys, the 'd' the 'e' the 'v' the 'spacebar' the 'm' and 'enter'.
No Winkey+ "D", "E", "V", SPACE, "M" will minimize everything and open windows explorer, then minimize it.
...which makes no sense at all.
You need to press Win (to bring up Start), then type "dev m" in Search, and press Enter.