Hi, I hope any of you guys can help me with this kind of weird problem.. I can't return the item 'cause I left the country. About 10 days ago, I upgraded from 4GB to 8GB of RAM in my MacBook Pro mid 2010, I bought a PNY DDR3 PC-3 8500 1066MHz, just like the one Apple recommends. When I put it in, the system recognized the new 8GB just perfect, everything works just fine, the improvement was noticeable. The computer works great, I can use it for about 6 to 8 hours non stop without a problem, Safari, iTunes and Excel open. But, about 4 or 5 times the screen goes into lines of colors (pic) and I had to shut it down with the I/O button, nothing else works, this has happened more or less when I'm using Firefox with about 20 tabs opened, and also tried Chrome and the same thing happened. I have switched the RAM positions, in and out 3 or 4 times, at first works perfect, but when I have so many tabs opened it's usually when the screen freezes. So, my question, is this problem related to the RAM upgrade or something else? I have put my old 4GB RAM back and this problem is not happening. Thanks.