GE xl1800 issues

Microwave heats, but no turntable or light. A few motnhs ago our microwave stopped heating. It was usually corrected by unplugging and restarting. A week ago, the microwave started making a grinding noise while cooking; the light flickered and then it turned itself off. The interior seemed very hot. The fan also started to run when the door was opened. This happened a few times, then the panel went blank. We stopped using it for a few days and now the microwave heats (no more grinding noise), but the light and turntable do not work. Help!