i have a mac mini and starting today for no reason it turns off it turned off like 5 or 6 times and when i try to turn it on nothing happens for a while i click the power button and i see the power light on but i dont hear the noise that you here when u turn it on. so i keep repeating the same thing a few more times then it comes on. also the times it does not turn on when i see the light if i put my ear up to the mini i hear an small noise. also i have a memory problem but i had this problem for a long time because one min i could have 5gb then another min i could have 50gb and i dont delete or dl anything eather.