There are 3 main possible reasons for it:
-PCH
-ME
-thermal sensor
So, first of all you should do - programm bios with CLEAR ME-region by programmer. Also, do this need to reconnect RTC battery.
write down the correct name of notebook from bottom case like K42Jx-Sxxxxx
Also you should read this
article where you can find basic knowledges what is need to do.