It sounds like you're having trouble with your AC/DC fan's circuit. There are a couple of things you can try to diagnose the problem: *Basic Checks:* *Power Source:* First, make sure the fan is plugged in securely to a working outlet. If you're using a battery, ensure it's properly installed and has enough power. *Speed Controls:* Try adjusting the fan speed settings on the remote or the fan itself. Sometimes a switch or button can malfunction. *If the above don't work, here are some possible causes related to the AC/DC circuit:* *Fuse:* Some AC/DC fan circuits have a fuse that can blow if there's a surge of power. Check your fan's manual to see if it has a fuse and how to replace it. *AC/DC Converter:* The AC/DC converter circuit rectifies the AC current from the wall outlet to DC current for the fan motor. If this fails, the fan won't receive power. *Other Circuit Components:* In some cases, other components within the circuit like resistors or capacitors can malfunction. *Safety Warning:* Unless you're comfortable working with electronics, it's generally not recommended to attempt repairs on the AC/DC circuit yourself. There's a risk of electrical shock and further damage to the fan. Here are some resources that can help you troubleshoot further: *Repair Videos:* There are many videos online that show how to repair AC/DC fan circuits [YouTube](https://www.youtube.com/). Be sure the video matches your specific fan model before attempting any repairs. *Consult an electrician:* If you're not comfortable fixing the circuit yourself, consult a qualified electrician to diagnose and repair the problem. I hope this helps! Let me know if you have any other questions.