After returning my first one because it arrived the same day as the newer better ones, I received this one. I have been having problems with it waking up from sleep and having to enter the password two times on occasion after waking it up. Lately I have also been noticing, including just now while searching this forum for a solution, that the display flickers to complete black, and then will sometimes come back on if I gently tap the wrist rests! Loose solder? I don't know, I was hoping someone here would have an answer. Since I had them put the 160gb drive in I don't think they will take it at the local Apple store. I bought it online. Other than those issues, no problems with the yellow screen or dead pixels. I am pissed as hell about having to send another one back, AND FULLY EXPECT THAT THE NEXT ONE WILL BE ****ED IN SOME WAY TOO! Btw, long time Apple user, so no sour grapes, just frustrated! Thanks in advance for any help.