Recived my laptop from acer repair today and they said they couldnt find any problems and they looked at it for 5 hours +.. The problem is with the display, when i click on the change user button i get lots of dots on the screen everywhere. I then got told it could be the things i plugged into the laptop (mouse, speakers & laptop cooler) i then remembered i started using my kid brothers charger wich fits perfectly and charges as well.. They are different models of the laptop but of the same brand (acer) could it be the charger?