still under warranty I assume ... get it sorted out with them .. ? It doesn't really sound common and I wouldn't go playing with it so send it back .. might take a few days to a week or two to get it back though
I ended up getting a cheapish dell and didn't sort out the 1 line dead on the screen ... when it happened after 2 months only to remember shortly after I'd only paid the 90 days of warranty .. very ****ed about that ...