A slightly bulged top 680uf 200vdc electrolytic cap was what alerted me to what happened to Jim In Denvers Megawatt. If the unit uses TO247 size rectifiers pull them and test with a DMM. Same for the BiPolar Transistors. It would be rather low percentage for both the control and power circuits to fail simultaneously. If you cannot find fault checking the power discrete components then tge outlook is bleaker. I use a rude and crude method to weed out bad large electrolytic caps. I use a 1000piv diode and charge the cap. I wait overnight and then compare remaining voltage with a known good cap. It's not quite an ESR grade test but it separates the stallions from the geldings ha ha.