Mini mac won't start up
Mini mac won't start up... When I start up my mini mac, the apple logo appears and then the time wheel for a few seconds and then it just stops and the screen goes black.I have tried safe mode start up, holding the CMS and R key, starting from the DVD etc etc etc but it seems that the start up times out before it boots up if that makes sense. Nothing results in anything coming up on the monitor. I did an upgrade on the 31st march and have had this problem since... Please Help!
Mac mini