First and foremost, before connecting the power supply to ANY electronics and powering it on please check the following first:Always test electrical components with a digital multimeter with audio feedback before connecting to other components such as PCBs to prevent burning them out.Mare sure the PSU is on 110V for North American power standards. The switch is just inside the case on the bottomMake sure you have dialed in the PSU voltages with the potentiometer on the PSU to be as close as possible to +12v and +5v.Make sure the PSU has the correct voltages or the PCB or application you are using it for as not all PCBs have the same power requirements. We don't know what you have, so this is up to you to determine whether or not this product will be suitable for your needs.Make sure the wires are connected to the correct terminals and they are not mixed up on the other end. We have a Wiring Diagram for the Switching Arcade Power Supply below.We also have multiple videos on arcade power on our YouTube Channel.If your power supply is still not providing power, or is not providing correct voltage, check for any damage to the product and contact Customer Service for further instruction.