Get the service manual from hifiengine.com, go to the second page after the tuning string diagram and look at adjustments 12 and 13. Do #13 first. That sets the power supply voltage. If it won't set to 35vDC, there is a problem that can be focused on. If it will set, then do #12, which has four power amp settings. If they won't set and the power supply will, your problem is in the power amps. To do the settings, select AUX mode and volume at zero. Caution! Do the tests by connecting minigrabbers to the proper pins with power off. Power up, take the reading on DMM and power down to remove leads. Repeat for each test. These tests will give some good information to move forward. If the PS won't set, stop there and let us know.