Seems a lot of Dell Inspiron 1420s are having this problem, and mine is no exception. Now only works without a hitch if tied to an external monitor, and even then some application will crap out the display e.g. FM2010. Oh and mine's also on Nvidia 8400m gs GPU. Wondering if it's worth it to repair or just sell and get a new notebook. BTW, some trader is offering only RM350 for my faulty lappy.