If it is still covered by warranty, send it to repair. ASUS guys do not have any tools to check the firmware version, etc. Your unit would be replaced.Originally Posted by fusterjj
Adding a serial port will void your warranty too, as long as your remove warranty seal on one of the pads, unless you attach a cable by unscrewing two screws only. Getting CFE (not the pmon) prompt could help you to find out the problem.