My dv6700 screen is dim, displays correctly on external monitor

HI,
I have a dv6700 laptop that I am having screen problems with. The computer boots just fine, but the lcd is so dim you can barely see that it is on at all. The computer does display correctly on an external monitor. I have even tried switching the lcd out with another known working one and the second one did the same thing. Just to eliminate it, I did try the first lcd with another motherboard, and had no problems with it. I'm pretty sure I have my problem isolated to the motherboard...
Does anyone have any other troubleshooting suggestions before I conceed defeat and give up on this motherboard? I don't know if there are any settings anywhere that might help, something like that. Would the Windows display driver affect the boot up and splash screen? Bios is dark as well. Thanks in advance!

Take a look at this thread and see if it helps.  You did look into your power settings on and off the battery?
http://h30434.www3.hp.com/t5/Notebook-Display-and-Video/brightness-problem-on-pavilion-m6-dim-on-bat...
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