Hi, all, I'm very happy with my 2010 MBP 15" i7 -- very slick little piece of kit! However, there have been a few cases recently where I had to force a hard-shutdown of the laptop (holding the power button for 3 seconds). This is not because of the actual MBP per se, but because of some software that froze and wouldn't let me force-quit them. Anyways, I'm wondering, since I had to hard-shutdown several times recently, if I should check my OS for any weird happenings? I always, always do Apple > Shutdown, but I've been forced to use the power button recently. If I am due for an OS diagnostic, what (free) software could you recommend? Thanks for your help!