I'm using a MacBook Pro, early 2011 model with Mac OS X Version 10.7.2. When I run Software Update, it alerts me that a firmware update is available, however every time I download and install the update, it prompts me to restart my computer. I do so, and every time it gives me a very audible noise and never restarts. After I manually restart, software update alerts me that the update is available. Anyone else having this problem?