I posted yesterday about getting a black screen after waking the Macbook Pro from sleep (doesn't happen everytime). This morning, I booted up and received the same black screen. At the very top are 30 or so multi-colored lines and I have to do a hard reboot. This problem hasn't happened during normal usage... yet. Seems to occur after wake/power up... but very random. Last Friday I upgraded the RAM to 4 gigs. I'm currently researching issues with 3rd party ram and the Macbook Pro's and it does seem to be a problem (though it seems the problems reported are freezing during usage, which hasn't happened to me yet.) Does this sound like a hardware issue to you? What can I do?