I have yahoo messenger and explorer most of the time running and it seems fine but when I take it off the A/C adapter the screen itself goes black. I can still hear music playing through my headphones but the screen is just at a black screen, its on just black. I've cleaned out PC's but I've never cleaned out a laptop, would dust be a problem? I've only been cleaning the keyboard once or twice a month. I also have registry cleaners and its made my system faster noticably but once it comes off the A/C it goes black. I reverted back to the original video driver, nothing helped there. I use this for school so I cannot do a complete reinstall with the manufacture DVD because of all the files on here. Any suggestions?