Found a Power Mac G4 MDD today!

Discussion in 'PowerPC Macs' started by FineFuturity, Nov 26, 2014.

  1. FineFuturity macrumors member


    Feb 19, 2012
    TX, United States
    Found a PMG4 MDD today for $10, and it came with an old Apple Studio Display, too! Unfortunately, it doesn't power on due to (as the guy that sold it to me said) a power surge from the lightning storm we had a few nights ago. Said that the power button light would come on for a second and then go out again. I immediately suspected a failed PSU, but I supposed not.

    Supposing that the PSU was still intact, I went to google to see what people said about this. Some said that a dead PRAM battery could make the MDD refuse to boot, so I took the old one out to do a PRAM reset while I went out to buy a new one. When I got back, I replaced it and tried to power on and... nothing. Then I tried a PMU reset by pressing the reset button on the logic board. Still nothing. I tried taking out all the RAM and putting one stick in at a time to see if any of it was bad. Nothing. Finally, I looked to the red light that people talked about, as it apparently tells you if power is coming to the board at all. No light when pressing the power button :(

    I can only now guess that either the logic board or the PSU (or, hell, maybe even both) were fried in the power surge the dude told me about. Hopefully I can find a replacement for cheap online or something. But before I do, any suggestions from you guys?

    Oh, and the silver lining? I got a working studio display out of this :p
  2. redheeler macrumors 604


    Oct 17, 2014
    Neither one is cheap on eBay, and both could be fried. Congrats on the Studio Display though, $10 is a fair price just for it.
  3. Ih8reno macrumors 65816


    Aug 10, 2012
    Oddly enough I also recently came into an MDD myself, the 1.42 dual model. Same symptoms and the only thing that worked was when I swapped out the power supply from a working dual 1.25ghz mdd.
  4. cocacolakid macrumors 65816


    Dec 18, 2010
    Had the same problem with a 1.42 MDD and it was the power supply.
  5. Altemose macrumors G3


    Mar 26, 2013
    Elkton, Maryland
    This seems like a power supply issue to me. I am guessing that the surge may have blown some capacitors on the PSU board. You may be able to rebuild the PSU for cheaper than buying a used part.
  6. PowerMac G4 MDD macrumors 68000

    PowerMac G4 MDD

    Jul 13, 2014
    At the intersection of Conch and Coral.
    I heard someone call my name... ;)

    I passed by this thread a few days ago, so sorry for being late. Congrats on the find though! The Studio Display is definitely one of those things that's either expensive or sometimes very cheap. Normally they are sort of expensive on eBay, and aren't always in the best condition (whether cheap or pricey). I have three of them (and actually missed out on a chance of getting a nice fourth one :( ), and they are definitely among the coolest-looking Apple displays. The issue with your MDD is a common one. These things are known for their PSU issues, and I see working PSUs go for as much as $90 on eBay. (not to mention the fact that many MDDs are being sold online for more than most PowerMac G5s).
  7. Hrududu macrumors 68020


    Jul 25, 2008
    Central US
    Press and hold the power button on the display. I've got a MDD that only likes to come on using the display power button when its held for a couple seconds.
  8. DZ/015 macrumors 6502a


    Mar 23, 2003
    New England
    If you don't mind a little drilling and soldering, you can fit a micro atx power supply inside the original power supply case. Ditch the 2 60mm fans for a single 80mm fan makes it much quieter as well.
  9. catzilla macrumors 6502


    Dec 15, 2013
    Rhode Island
    I have one of those as well. I can't use it without my ACD.

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