1. Please test the 3 LED strips. All should be within a volt or close to it.Bad LEDs will sometimes shut down a power supply. 2. Check the fuse near the AC power connector and make sure it's blown or not. ( if it is then you probably have a bad power supply ). 3. Check the voltage to the main at the main connector. See if there is 12volts regardless of what button youpuse. If you see 12 volts and you see voltage on PSON then your main is bad. Only voltage you should see before power button is pushed is 3 to 5 volts PERIOD.Only after the button is pused you will see 12volts.and not before. Thanks and this board works flawlessly and do have LEDs if needed and can post another auction if needed.