no display on iMac G5 (iSight)

Discussion in 'PowerPC Macs' started by aldorande, Dec 1, 2009.

  1. aldorande macrumors member

    Dec 1, 2009
    Hello all

    today I tried to exit the sleep mode in pressing a key(as usual), but it shows no display, and after a few seconds the fans have become noisy.
    I have been using my Mac for bout four years (I almost never turn it off) so I wonder if it is coming to his life's end.:mad:

    I tried a PRAM reset using the Apple+Alt+P+R keys: I got the second bong but no luck, the display stays black and eventuelly turns off.
    I unplug it for a long time, and replug/power on: no luck
    I unpluggued all the peripherals (keyboard): same issue, but the power LED blinks/stays off

    I'd like to try an SMU reset as mentionned in step 5 of this article:

    I removed the memory access cover as per User guide. But then it mentions two rings in the RAM slots and I think they're inside. So I cannot remove the RAM or take off the back cover.

    Any ideas on that or on my issue in general?

  2. quantum003 macrumors 6502a


    Apr 27, 2009

    Does it sound like your machine is working just fine, other than the screen being black? Press the sound keys up and down, etc. If so, take a flashlight and shine it at the screen, look very closely. Do you see a very faint image? If so you just need to replace the display inverter, and you are a very lucky cat indeed. :D
  3. aldorande thread starter macrumors member

    Dec 1, 2009
    It seems like you said
    I hear the bip when pressing the volume key

    I am doing a target mode and I'll think I need a quote for the display inverter
  4. aldorande thread starter macrumors member

    Dec 1, 2009
    just a recap. Target mode has worked : I was able to retrieve my 400GB data. It only took my about 14 hours.
    Removing the additional RAM would not help.

    I believe that it is the display inverter even if I look very closely it's REALLY black. So now I can think of 2 solutions :

    1/ getting my new chrismas present: an iMac 21,5' :)
    2/ buying the display inverter on eBay (or selling the parts if I apply solution 1 ) :D
  5. flopticalcube macrumors G4


    Sep 7, 2006
    In the velcro closure of America's Hat
    Why not do both? Try to fix the G5 up and then sell it on eBay. If it doesn't work you are out at most the cost of the inverter. If it does, you will get a lot more for a working G5. Its probably time to move on to Intel anyway you cut it.
  6. aldorande thread starter macrumors member

    Dec 1, 2009
    is there any website that will explain how to open a broken mac? :D
  7. aldorande thread starter macrumors member

    Dec 1, 2009
    any update?
    I bought the display inverter but I don't how to open the iMac.
  8. Jordan6 macrumors regular

    May 21, 2006

    I've had both iMac's(pre-isight & iSight) and experienced the same problems and more. I had to keep mine on for weeks-months at a time.I would put it to sleep and it would take about 1-2 days to come back on.I took it to a apple repair center and was told the logic board is fried and the power supply was on it's way out also. The capacitor's exploded. VERY common for these particular iMac's. From what I was told you have to replace the Logic Board, and power supply. Logic board is pretty expensive, so you might be better off saving for a new computer.

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