Not sure what's up lately with my Macbook pro retina display, but it keeps freezing/crashing randomly and I'm unable to do anything. I have to hold down the power button to restart it. I've updated to the latest OS X Yosemite V 10.10.5 and still hasn't fixed the problem and not sure whats causing it. I'm worried I'm damaging the computer by always having to hold down the power button. Any ideas?