Thanks, XXXXX XXXXX is one of the door switches has failed, the door switches are number 29 and 30 on this diagram .you will need a volt meter (multimeter) to test these. the one for the light is stuck in the closed position. there are two different switches,ones normally open and the other is normally closed. heres a link to the switches, the gray one above is normally closed when the door is shut,the black one normally open.check the switches and replace the bad on.
switch link.---- http://www.repairclinic.com/GE-Microwave-Model-HVM1540LN1CS-ID-707448-Parts?s=b3a6d707448e
thanks and if you have any further questions just ask. Bryan