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Martin, first check the 5v output of the voltage regulator (IC11). Next, look at the cathode end of D3 near the front left side of the board. You should see your 12v input there (less the diode drop). Also make sure the D3 cathode is toward the front of the board. If all of that is well, then it is likely that you have a bad solder joint or two associated?with?the 90 degree pin headers and/or the sockets on the front panel board. Or an issue with the on/off switch. Try those spots and let us know what you find ... 73 .. .Ron