Hello all, Recently, I turned on my MBP and had to do a hard shutdown (hold power button down) after 2 minutes of the white screen with the apple logo and spinning cog in the center. When I pressed button again, it started up normally. This is actually the second time its happened in about a week or two. I don't know if this makes a difference, but I have a USB keyboard and mouse connected to it on boot up. Should I be concerned? New to Macs, is there any way of checking to see if the hard disk or OS (mountain lion upgrade) is ok other than "verify disk" in Disk utility?