I am having the same problem. I see the regular orangeish color change to blue striped as I open and close the lid. I took the back off of the mac and wiggled the wires soflty to see if there was a loose connection. I cleaned out the dust and didn't see anyting that looked like a problem. On the right side (when looking at the back of the mac), there was a wire up next to the screw. I moved it over thinking it may be getting pinched. I put my mac back together and still see the flickering.
Looking for answers.
Thanks!
Karla Fliger