I am starting to have problems with my once perfect Macbook (13.3" Late 2008). Several months ago I upgraded my HD to the Seagate Momentus XT Hybrid (750gb) with zero issues. The computer ran much quieter and cooler as I had nearly maxxed out the original drive with music and photos. After reading numerous forum posts and articles I learned that I would also be able to upgrade my Macbook to the 8GB RAM. I verified that my computer had the required specs for the upgrade and ordered this RAM: Kingston 8GB (2 x 4GB) 204-Pin DDR3 SO-DIMM DDR3 1066 Laptop Memory Model KVR1066D3SOK2/8GR Being impatient and wanting to really re-vamp my computer I then ordered a Snow Leopard upgrade as I was running Leopard. I only ran SL for a few days before my RAM sticks came in and only noticed one issue...iTunes would sometimes act a little goofy when synching my phone. Being a new "toy" I would try to wifi sync and it would, at times, freeze up my iTunes. I then received and installed the new RAM modules. The iTunes seems to be freezing a bit more often with the new RAM installed. I lost sound from my speakers and after reading some posts reset my PRAM. AFter the reset I needed to go into my settings to turn on the internal speakers and now sound is back to normal. Then again, while synching, iTunes locked up. AFter several hard boots I received a gray screen when trying to close a frozen iTunes. Any advice?