My battery seems to have lost the plot. I can turn my machine on when running off the battery and it fires up as normal. Once it gets to my desktop everything is frozen. The arrow is always stuck in the top left corner and the only thing that works is the power button, but I can't even turn it off because I can't select switch off. It works fine if I take the battery out and run off the adaptor but kinda defeats the purpose of having a laptop. Any help would be much appreciated.