Im using acer aspire 4738G. In the morninh it still work fine for me but after a few hours it suddenly jam and appers some lines in the screen then turn into black screen! After i have to forced it shutdown by pressing the on button. Then when i on back the laptop its shows nothing on screen but i can see the power button is there. Is there any solution? MotherBoard problem? Or graphic card? Or others? This been happened several time.