My microwave isn't heating up or cooking anything, is it worth fixing or should I just buy a new one?..

Debra, we do many microwave repairs and it can really just depend on the problem and diagnosis to determine whether it is cost effective to fix. With the heat issue, it could be a diode, or magnetron, or even a board. I’ll attach a video below if you want to try and find out what’s wrong. It you’re able to, it’ll give you much better idea on what to do from there or opt to have a technician out to diagnose for you. Let us know if we can help you further!