Keeping it up to date is important, but there is a slight twist (as ever).
Trying to install Ubuntu on my Boot Camp partition crashed my iMac, and it will not now boot from its install optical disk. How can I recover it?
After installing additional memory, my iMac keeps falling over, usually with a kernel panic. Is this a problem with Yosemite?
After an interrupted firmware update, my iMac refuses to start up. What can I do?