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 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.Double check to make sure all ribbon cables are installed correctly. There is a top and bottom to them. One side has the contacts and the other side is smooth plastic. I have seen before where people insert the ribbon cable upside down and lose their keyboard functionality where it worked prior to opening.

With the display if the display worked prior to opening it and not now. Then double check the connections. Some laptops have a video connection plus a connection for the backlight power. Curious as to why anyone would mess with this connection though as for usually the battery is accessible under the keyboard on laptops vs having to totally dismantle it to get to them.Also i've gotten completely dead CMOS batteries fresh outta the package...they are on the shelfs a long time...DaveLembke

THANKS. I'll definitely make sure that both ends of the cables are connected.
The backlight is fine I think because I can SEE the screen flash when it powers down.
As far as the battery goes. It was on the bottom side of the motherboard. It wasn't under the keyboard.

Patio

I paid $7 for my battery at the famous Wally WORLD who don't give a crap about anything other than the money they make off people. Any clue where I can get it fresh and cheaper? I'll try anything...If you have a multimeter you can check to see if the battery is 3V. Additionally make sure its installed the right way facing down.
Yeah, the battery is facing the right way. I looked up images on Google to make sure. I can't get to my multimeter right now. We just did a major cleaning and my stuff I don't use frequently is locked up.UPDATE:
The display screen is working fine, but it still says that a CMOS battery failure occurred. I just bought the battery for $7 at WalMart.If you PRESS F1 to continue does this system otherwise function fine? What did you have to do to get your display to WORK again?
Thanks for the help everyone. :-)
I plugged in an external keyboard and reset the time and date in the BIOS and that fixed it. Dave: for the display I went in and made sure that all my wires were connected.