Chosen Solution
When I turn on my Mac mini my fan starts for 2 seconds and turns off and sometimes when I hit the power button unplug it and keep holding it and plug it back in the fan gets very loud and doesn’t display????
Not good your Radeon HD 6630M GPU has failed! This was a common issue in this series Macmini5,2. The Macmini5,1 and Macmini5,3 both use the Intel CPU HD Graphics 3000 and don’t have this issue. You’ll need a new logic board, heres the guide to replace it Mac mini Mid 2011 Logic Board Replacement. You may want to look for a used system as it will likely be cheaper.
