My laptop keyboard is not working after cleaning the fan

[rockdude668]

Hello, My laptop is Toshiba satellite L850-I2011.
My laptop was overheating so, I cleaned it and when I turned it on it showed a error that ***RTC Battery is low. Press F2 to set Date/Time***. I googled that on net that you can use a external keyboard for first time set date and time and then the keyboard will work, so i got a external keyboard and it worked, but my internal keyboard didn't worked but in my internal keyboard num lock was on and on my external keyboard num lock was on too and when I turned on Caps Lock it also on both I don't know what problem is coming. PLEASE HELP.

 

[ffg7]

try re-seating the laptop's keyboard ribbon cable as not seated all the way into the motherboard connector.