Hey, Anyone else having this problem? I installed 10.10.2 through the App Store update and also tried through the apple website as an individual installer. Every time I do this the computer won't boot up and gives me the "cancel/prohibit" sign. Only way to fix it is to restore from time machine backup to 10.10.1. I have a MacBook Pro 2009 13" with added SSD/HD combo. Yosemite is on the SSD. Thanks.