ok i have a 1.42 mac mini had it for like 8 months. lately it has been action up tho. like i will put it to sleep and like 5 secs later it will wake itself back up. or it wont be asleep nothing open and the hd will start running fast for a min then go back to normal. what could be doing this? i am completly lost. and cant think of anything that would be making it do this.