ASUS K40IJ black screen
motherboard K50IJ rev 2.1
AL82G40
AF82801IBM
I can notebook switch on,power led shines, but thats all only, black screen. All voltages are OK.
I tried reflash BIOS without change. I heard about problem with onboard memory on K50ij boards.
I would like ask :
- how to cut onboard RAM off and work only with SODIMM in memory slot?
- does anybody find solution , how to recognize bad onboard memory chip?
i- f i remove all memory chips from board, will motherboard work with memory in slot?
Thanks for advice.

Maybe soldering contact failure on socket or north bridge. Push a little alternately at first on socket and than switch on the laptop. If no works than do this manipulation with AL82G40.