junsen02, I believe that there could be different reasons for this. First, I think this model has some BIOS issues. You can reflash that. check this [http://www.leosquarez.com/acer-aspire-one-bios-recovery-acer-aspire-one-zg5-screen-not-working/|link] for more info on it. there is also the possibility that it is over heating. You may have to disassemble it and follow the guides [[Device:Acer Aspire One ZG5#deviceGuides|on here.]] Make certain that you have good airflow. Once you get it accomplished, reevaluate and let us know hoe it is going. Good Luck