i cant get into the start menu, i turn on laptop, dell logo appears, then i get press f1 to contnue,f2 for setup, or 5 for diagnstics,when i continue it flashes blue screen and restrats again, f8 works on my advent but not on the dell,dont know what to do, it also says that it cannot determine the ac adapter, this is a replacment, but have been fine till now. ta