Hi. I have a 2.4ghz glassbook and I recently upgraded the ram to 4gb from OWC. Ever since the upgrade I have been getting complete system freezes where the screen goes black with coloured bars. This occurs seeming randomly under both heavy and light usage. OWC says thats is a logic board problem and to call apple. Apple says its a problem with the memory. What do I do? I reset the PRAM and ran memtest for several hundred cycles with no problems found. I found this thread at apple on the topic: http://discussions.apple.com/thread.jspa?threadID=1757875&tstart=0 Any thoughts? I don't have the original ram anymore.