Dell 6000 When power cable is pluged in screen goes to hibernation

Thats correct. When I plug the power cable in the screen goes blank and into hibernation. I turned off all hibernation settings and it does the same thing. I switched power plugs to see if the problem was the power and no change. If the power is not plugged in all works great. If the power is plugged in when the laptop is turn on then I see the boot screen but all goes blank when it gets to windows. I tried safe mode but no luck with the power plugged in. Any ideas would be welcome.