It sounds like you are having an overheating issue (hence the fans getting louder and faster) which may have started to fry your graphics card. Not good.
Try installing something like "Speedfan" to see if you are actually getting the overheating. If yes, then the only way to fix is to either replace/repair it yourself, or have someone else do it for you. Unless the device is still under warranty. If so, then you need to contact the manufacturer about repairs and/or replacements.