I have an Acer Aspire 6930G and recently I noticed that after a period of time the screen started flickering and then going black while the laptop still working. Now my laptop when is plugged in with the psu to power and Im starting it, Acer logo appears on screen and then screen goes black. If its working with the battery everything is ok. I have changed the psu but the issue remains. I should say that the battery is not very fuctional and the laptop used to work plugged in power. Do you have any suggestion on how to fix it?