Inspiron 8600 Lcd Is Acting Up

According to the folks at dell i need a new motherboard. I'll put it to you here first. I get error messages when running the diags either from the cd or from f12. Here are the symptoms that prompted the diags. My screen boots in a dim mode. From the dell logo on it looks like the screen is in a power saver mode. Both on ac adapter as well as battery power. All power saver modes are off. If i adjust the angle of the screen, it'll go blank sometimes or other times the images on the screen are shaky like they are vibrating. If i type, the screen goes back and forth between full back-light and dim back-light. Sometimes it even gibberishes the words on the screen to look like another language. If i bumb it just right, the screen will bounce back to normal. If i bump too hard, the display goes out. At reboot, i get a "two beep" signal and no boot. I have opened it up to check connections, i have replaced the lcd with a new one (thinking it might be the inverter or backlight) but still the same behavior. That's when i got dell online to help me troubleshoot and they said definitely motherboard issues. Any thoughts before i invest further?

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