Hi All, I've got a 2011 MBP, it's logic board got replaced a little over 1 year ago under warranty. I'm currently experiencing the following issue: - My MBP suddenly crashes every now (increasingly frequent): the screen just freezes, even the time remains the same, no beachball though. - Successfully restarting the computer (via a hard reboot) is then very difficult; typically horizontal bars and a broken Apple logo appear first. - Previously I was able to get it start up properly after a few attempts by randomly doing any of the following things: COMMAND+R, OPTION+R+COMMAND+P, and/or replacing/switching my RAM modules (typically leaving one slot open), whilst hard rebooting after each attempt. - However the issue has become more severe and problematic now; what's interesting is that currently the only way to get it boot up is the following: start the MBP so that first the horizontal bars and broken Apple logo appear, wait a little longer until the completely grey screen appear, then leave it on like that until the fans are spinning to the max. When I subsequently do a hard reboot the MBP starts up just fine. Weird right? Any expert thoughts on what might be causing the issue, and more interestingly; what could be the fix? Many thanks for any and all help and thoughts!