Take it to the Apple Store to have it fixed... maybe even ask to talk to a manager at the store. Since it is a standard stack machine they can actually just swap it for you.... yes, even though you didnt buy it from apple they can make that exception. otherwise have it fixed. Also, MacMall tends to take out the Apple A++ RAM and put in a lesser quality RAM so maybe that is the issue? I'm sure they can fix it up for you.