Whenever I try to plug in an external monitor, my laptops screen goes black and I can not get it back up without restarting my computer. I’ve tried using F4, and I’ve tried closing and opening my laptop. It seems to completely stop my laptop from running, since sound seems to stop when this happens. I also get no signal in the external monitor. Any idea what’s going on? I’m using an HP Pavillion Dv6 Notebook PC.