hi all i have a acer travemate 4220 and i can turn it on and run for as long as i like but when i close it down i have to wait half hour before i can restart as when i click power on the lights flash an it wont boot up so i changed fan an heat sinc??? still no good tried new hard drive and new ram still the same ??? so any ideas be great as to me its over heating but when it cools down it starts again