My ps3 will put green dots and other stuff on the screen and then eventually freeze up. ive taken it apart more than a few times now and i cant figure it out. i thought i had the problem fixed the first time i took it apart by leaving the top half off and settin a big fan infront of it to help keep it cool. that worked for a moth or so but now the problems back and i cant get it figured out. any help would be greatly appreciated!!!

SAFE MODE: Place your finger on the on/off sensor leave it their until you machine turns off then take your finger off, place your finger back on the on/off sensor leave it their until you hear 2 consecutive beeps then take your finger off. Once in safe mode select the option PS3 System Restore. NOTE: The system restore will delete all of your saved game data I recommend backing up you system if you can.

Taking you PS3 lid off and placing a fan over the top won't cool anything except the Blue-Ray deck and power supply if anything is causing an overheat it would be under the metal plate that those 2 components are sitting on and even then the overheating is on the underneath side of the motherboard where the heat-sink fan is. If the system is getting to hot it has a safety feature and your PS3 will turn off usually causing the YELLOW LIGHT OF DEATH which would force you to take your console down the motherboard and do a flux and reflow of the board. Good Luck!