Microwaves can encounter a range of issues, from not heating to strange noises. First, check the power source and make sure the microwave is plugged in properly. If the microwave isn’t heating, the problem may lie in a defective magnetron, which will need replacing. Other common issues include a malfunctioning door switch or turntable. Always disconnect the power before attempting any repairs, and consult the user manual. This guide provides step-by-step instructions for diagnosing and fixing common microwave issues.