12 Replies Latest reply: Aug 3, 2013 10:33 AM by Allan Jones
bateria Level 1 Level 1 (0 points)

The power-up sound is distorted and the power-on light blinks three times continously and is dimmed. I do hear the processor working. Any solutions???


eMac G4, Mac OS X (10.4.11)
  • 1. Re: My eMac screen is completely black.
    a brody Level 9 Level 9 (63,295 points)

    The processor doesn't make a sound.  The fan makes sounds and so does the optical drive or hard drive.

    3 blinks is typically a sign something is wrong with the RAM.   This article explains for PowerPC Macs what that would indicate.  Unfortunately, it looks like your RAM banks on the logicboard have gone bad.

  • 2. Re: My eMac screen is completely black.
    Allan Jones Level 7 Level 7 (30,445 points)

    Although hard to see externally, there are two broad familes of eMac based on the logic board inside and sub-families within each family. Each can have different issues so our knowing what you have will help us better help you.

     

    Please use this Apple article:

     

    http://support.apple.com/kb/HT2395

     

    to use your serial number to find which model is yours. Please only post your model family, NOT your serial number.

     

    While you have the serial number at hand, see if it falls into one of these ranges:

     

    • G8412xxxxxx- G8520xxxxxx
    • YM412xxxxxx - YM520xxxxxx
    • VM440xxxxxx - VM516xxxxxx

     

    If so it could have a known logic board defect that is today not worth repairing.

     

    eMacs, unlike G4 PowerBooks, do not have a history of bad RAM slots. Can't say that's not the issue but it would be very rare in the eMac.

  • 3. Re: My eMac screen is completely black.
    a brody Level 9 Level 9 (63,295 points)

    It is possible the capacitor has leaked onto the RAM slot on the logicboard.  This would create such a scenario.

  • 4. Re: My eMac screen is completely black.
    Allan Jones Level 7 Level 7 (30,445 points)

    It is possible the capacitor has leaked onto the RAM slot on the logicboard.  This would create such a scenario.

     

    Indeed. That's why I asked about the sub-family. The serial number ranges I posted are the ones with 1.25gHz processors and USB 2.0 logic boards with leaky capacitors. In the ones I've examined, the goop from the capacitor was small in volume and was limited to showing on the capacitor "can" itsef, but a big leak could do what you suggest.

  • 5. Re: My eMac screen is completely black.
    bateria Level 1 Level 1 (0 points)

    Thanks for your concern. So it was the sound of the fan.............was..Just tried to turn it on again and it is completely dead!!!! Guess I'll have to take it to the shop for them to recuperate any data I might need, then toss it away. Any other advise would be appreciated.

    Wonder if it is more economical to remove the hard drive myself and take it to the shop.

     

    Serial starts: YM3182

    G4- 1 Ghz/128/60/Combo/56k/110v

  • 6. Re: My eMac screen is completely black.
    Allan Jones Level 7 Level 7 (30,445 points)

    Wonder if it is more economical to remove the hard drive myself and take it to the shop.

     

    Before trying to take it apart yourself, understand that there are very high voltages in the video circuitry. Enough to kill.

     

    You have to take precautions in taking one apart; I've had dozens of Mac apart but don't feel comfortable with our two eMacs. I value my life more than the data.

     

    Here's an in-between approach. Search the web for "emac takeapart." Find the article the has the MOST cautions, then read the steps. See if they show the following;

     

    1) A way to discharge the CRT voltage (very important

    2) A way to access the hard drive without exposing yourself to the dangers in the video department.

     

    Then you can make an informed decision as to whether you want to tackle the job yourself.

     

    My bottom-line recommendation: let the pros handle it if you consider yourself an average computer user.

  • 7. Re: My eMac screen is completely black.
    bateria Level 1 Level 1 (0 points)

    Thanks for your advise. I've taken the eMac apart to clean the fan following thorough instructions found in the web

    but don't remember any special precautions on high voltage. What I find strange indeed is that the DVD slot won't come out manually using a pin.

  • 8. Re: My eMac screen is completely black.
    Allan Jones Level 7 Level 7 (30,445 points)

    What I find strange indeed is that the DVD slot won't come out manually using a pin.

     

    Starting with, I think, the slot-loading iMacs in 2000, the computer had to be powered up for the manual eject to work.

     

    but don't remember any special precautions on high voltage.

     

    Surprising. With any all-in-one CRT computer, that's one of the first cautions I see in most service manuals.

  • 9. Re: My eMac screen is completely black.
    bateria Level 1 Level 1 (0 points)

    This is what I used to disassemble and clean the fan some time ago.

    http://www.applerepairmanuals.com/emac-disassembly-sheet.pdf

     

    Talked to the Apple techs and they charge me $65.00 to retrieve my data up to 65 gig. plus discard the computer for me.

  • 10. Re: My eMac screen is completely black.
    Allan Jones Level 7 Level 7 (30,445 points)

    Well, it looks like that sheet shows getting to the hard drive. However, it may be missing the high voltage warning because it's not an Apple publication. I'm still nervous enough that the $65 is sounding cheap. Do you think you have more than 65GB of data on the drive?

  • 11. Re: My eMac screen is completely black.
    bateria Level 1 Level 1 (0 points)

    Don't think that computer holds 65 gig!!!

  • 12. Re: My eMac screen is completely black.
    Allan Jones Level 7 Level 7 (30,445 points)

    Don't think that computer holds 65 gig!!!

     

    Quite likely. Our first eMac, a G4/700 (very first verson), came with a 40GB hard drive and our second, (1.42Ghz 2005--last version) came with an 80GB drive but a 160GB drive was a"build to order" option for that model.

     

    Looks like your version could have either a 40 or an 80 per the MacTracker database.