Re: Power Mac G4 MDD "Mirror-Door" won't power up

Hi, Toasty, Yes there is not even the standby voltages. i checked q1 and q1 and the pins are not shorted. couldn't get the caps which you suggested. I got 'HU3 105 deg C 390uF 450v' as a replacement for the main cap. connecting it didn't made any difference though

Re: Power Mac G4 MDD "Mirror-Door" won't power up

Thank you Toasty, Cyclones and others. My G4 MDD with Samsung PS has the same problem. There were only +25 Vsb and +5 Vsb. Everything else were zeroed out. I replaced the capacitors hidden under the heat sink following your posts, and after shorting green wire to common, got the fans working. Pin voltages were also proper. When connected it back to my G4 I got the 'jing' sound and it failed immediately. Now all the pin voltages are zero. It is not the fuse either. Any clues would be extremely helpful. Thanks