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What is happening to my sleeping Mac?

798 Views 11 Replies Latest reply: Jan 21, 2013 4:55 PM by somanna RSS
somanna Level 1 Level 1 (110 points)
Currently Being Moderated
Oct 16, 2012 10:19 PM

After I finish my work on the Mac for the day, I put the Mac to sleep [option > command > eject]. When I need to resume, I hit any key on the keyboard and the Mac starts readily.


Recently, I was out of town for 4 days and had left behing me a sleeping Mac. Upon returning, I found that the Mac would not wake up with a tap of the key. It had shut down and I had to switch it on using the power button. When I, after working with on the Mac for sometime, put it to sleep, some strange thing happened: the Mac started giving out an alarm: 3 beeps followed by a pause. the alarm would not stop and the Mac would not start despite me hitting several keys several times. I could silence the alarm by only by shutting out its power supply. I then pressed the power button again to start the Mac. After working on the mac, I put the Mac to sleep in the regular manner. After 2 hours later, I was woken up from my sleep by the alarm given off by the Mac. I could silence the Mac by keeping the power button pressed and shutting down the Mac. This morning, when I started the Mac, a grey 'reading bar' appeared beneath the Apple logo and after a while I had to enter my password to access the Mac.


I had a 'grey line experience' earlier too and I did this: went to disk utility and verified the internal drive which was given a clean chit. I then did a repair of permissions. I am yet working on the Mac and have not put it to sleep.


In between the first and second 'breakdown' [I do not know how else to describe what had transpired] I had done this: download 2 apps...paintbrush and seashore.


Any instructions and guidance regarding what the problem is and what I should do will be deeply appreciated.

iMac, Mac OS X (10.7.4), garage band, FCPX:10.0.5 version
  • John Galt Level 7 Level 7 (33,045 points)
    Currently Being Moderated
    Oct 16, 2012 10:36 PM (in response to somanna)

    Faulty RAM, it seems:


    Intel-based Mac Power On Self Test RAM error codes


    The solution to both of these situations is to first re-seat the memory and test the computer again. If the memory fails the POST test again, try memory that has been verified to work correctly on another system (i.e., "known-good") or order new memory ...


    To test memory, run Apple Hardware Test, but it may pass anyway. Run the extended tests. The POST code indicates bad memory so I would be suspicious of it even if AHT indicates it passes.

    MacBooks  iMacs  iPods  AirPorts, OS X Mountain Lion,  27 years Apple!
  • Friedhelm_ch Calculating status...
    Currently Being Moderated
    Jan 4, 2013 4:22 PM (in response to somanna)

    Hey Somanna,

    what did the technician tell you? Since a few days I got quite similar results when I am shutting my mac down or put it to sleep (3 short beeps, black screen, only poweroff stops the alarm sound).

    Start-up and working works as usual.


    And my USB adapter both fail to recognize different devices.

    I assume a logicboard problem since the RAM works perfectly.

  • John Galt Level 7 Level 7 (33,045 points)
    Currently Being Moderated
    Jan 9, 2013 8:11 AM (in response to somanna)

    somanna wrote:


    ... The guys at the shop inserted the RAM onto their laptop [windows] and reported that it was working.


    This is meaningless. The only way to rule out incompatible memory is to substitute memory verified to work on a Mac.


    Macs require memory that meets its published specifications. I recommend only two vendors: Crucial and OWC / MacSales.

  • Friedhelm_ch Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jan 10, 2013 2:02 PM (in response to somanna)


    Ok even if I am still to find out the reason for the beeps and other phenomena, the logic board (Explanation: core unit of your mac, or more detailed on remains my favourite guess. I will open the mac to see if something inside has melted or broken and if I cannot find the cause I will send it to a repair service.


    I will keep you guys informed.

  • Friedhelm_ch Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jan 21, 2013 11:19 AM (in response to somanna)

    After sending the MBP to a repair service they told me that it was indeed a serious logic board issue that caused the problem. Unfortunately, no fixing is possible and the replacement of the Logic board costs (900 Euro), which is simply ridicuolous. So this is why I will stay away from Apple from now, since my MBP after 1.5 years is already garbage.


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