My sister gave me her old laptop. I changed the CMOS battery. The display screen is not working. I have it plugged up to an external screen. It shows this "The firmware has detected that a CMOS battery failure occurred <f1> continue". I tried hitting f1 and nothing happens. I have tried f2 after pressing the power button but it won't let me change the time or date that way. I have heard people talking about resetting a jumper or shorting a circuit, but I have no clue how to do this. I have to do all this myself because I am flat broke so I can't pay anyone to do it for me. I have a Toshiba Satellite L655D-S5050. Any help would be GREATLY a appreciated.