I solved it by installing Mavericks clean on it, then doing the Yosemite upgrade from the app store. Interestingly when I installed Mavericks then went into the system profile screen, the SDD's TRIM ...

After announcing new iPads and Macs today, Apple has unleashed OS X Yosemite on the world as a free download in the Mac App Store. Yosemite is a major upgrade to OS X that’s been in developer and ...

June 2, 2014: Apple shows off Mac OS X 10.10 Yosemite for the first time at its Worldwide Developers Conference in San Francisco. Following the Jony Ive-redesigned iOS 7, Yosemite boasts an aesthetic ...