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My eMac screen is completely black.

705 Views 12 Replies Latest reply: Aug 3, 2013 10:33 AM by Allan Jones RSS
bateria Calculating status...
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Jul 31, 2013 9:29 PM

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)
  • a brody Level 9 Level 9 (62,005 points)
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    Aug 1, 2013 6:46 AM (in response to bateria)

    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.

  • Allan Jones Level 7 Level 7 (29,550 points)
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    Aug 1, 2013 7:13 AM (in response to bateria)

    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.

  • a brody Level 9 Level 9 (62,005 points)
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    Aug 1, 2013 8:35 AM (in response to Allan Jones)

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

  • Allan Jones Level 7 Level 7 (29,550 points)
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    Aug 1, 2013 9:11 AM (in response to a brody)

    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.

  • Allan Jones Level 7 Level 7 (29,550 points)
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    Aug 1, 2013 4:50 PM (in response to bateria)

    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.

  • Allan Jones Level 7 Level 7 (29,550 points)
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    Aug 1, 2013 6:56 PM (in response to bateria)

    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.

  • Allan Jones Level 7 Level 7 (29,550 points)
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    Aug 3, 2013 8:27 AM (in response to bateria)

    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?

  • Allan Jones Level 7 Level 7 (29,550 points)
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    Aug 3, 2013 10:33 AM (in response to bateria)

    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.

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