I recently got a new MBP refurb and for the past several weeks had been experiencing lots of crashes and strange behavior. For example, Safari would crash about 50% of the time when I visited the 'new' facebook page, but not the old one. iTunes would crash EVERY time I visited the iTunes store. I tried all the system updates and several reboots to no avail. I was getting ready to reformat entirely when I thought to go ahead and switch out to the 4gb of ram I had recently purchased (OCZ from buy.com). Switched the computer off, replaced the ram, turned it back on, and voila, no crashes at all in the past 2 days. Could a bad ram module really cause applications to crash persistently and predictably? I always thought it would cause random problems, driver issues, lockups, etc. By the way, the RAM I pulled out is labeled Samsung. Should it say Apple??