I just changed out the screen on my Dell 17r-5737, through a quarrel with my ex, which involved unplugging the keyboard and trackpad, along with the power button via ribbon cables. I have done this to other laptops before and I did unlatch the ribbon holders, but now only the power button works. The laptop is running windows 8.1, and will react to my external mouse and keyboard. I have unplugged and replugged at least 100 times now, and can't seem to mitigate the problem. Anyone know the problem?