After uninstalling some drivers and doing a hard shut down the machine is not fully booting. I believe it has Windows 8.1 on it. I can hear it running, it boots to a Dell circling screen, but after that, it goes black with an occasional network connection icon in the lower left portion of the screen. Moving the mouse produces a pointer with a blue circle sometimes, but just a pointer the rest of the time. This screen has been black for probably six hours now, so I don't think it is just a matter of a slow boot.