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iMac G5 (iSight) do not start up (A1145)

767 Views 8 Replies Latest reply: Feb 15, 2014 11:53 AM by rccharles RSS
YiANNiS-GR Level 1 Level 1 (0 points)
Currently Being Moderated
Oct 1, 2013 12:20 PM

The computer (iMac G5 20") was working perfectly for the last 8 years.

I shut it down on Friday and on Monday could not started up. Dead!!!

 

I open it and changed the PRAM battery, just in case, but the problem still persist.

(http://www.ifixit.com/Guide/Replacing+iMac+G5+20-Inch+Model+A1145+PRAM+Battery/1 153/1)

 

Now, I have notice that the power supply was making a noise (tik-tak-tik-tak, tic-tak...) but after I did try many many many resets to the SMU (http://support.apple.com/kb/HT1767) since then is just making a very very low continues noice.

After doing some research I found out that there are 4 diagnostic LEDs on the logic board under the right speaker.

(http://support.apple.com/kb/HT2831)

 

In my case LED No1 is ON while the computer is OFF.

After the reset LED No2 flashed for half a second, the fans were just moved for half a second but still the computer can not be started.

 

Any idea what would be the problem?

 

I guess the problem is the power supply, but before I go out there and buy a replacement, I would appreciate any help from anyone who either experience the same problem, or knows anything about it.

 

Thank you in advance.

  • emilycat99 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Feb 13, 2014 1:58 PM (in response to YiANNiS-GR)

    Hi There:

     

    Did you ever resolve your iMac problem?  I have the very same issue... and seek a solution myself.

  • Klaus1 Level 8 Level 8 (43,365 points)
    Currently Being Moderated
    Feb 13, 2014 3:00 PM (in response to emilycat99)
  • emilycat99 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Feb 14, 2014 9:04 AM (in response to YiANNiS-GR)

    Hi

     

    There is a great deal of confusion regarding the 1st and 2nd generation of iMac G5's ... you probabkly realized that also.  I went to YT for instruction on how to crack the case - and it is like night and day and of course in the case of the iSight model is much more difficult to access the guts of the machine.

     

    Hats off to you for resolving the issues.

     

    I am reluctant to sink a ot of money into this machine - but I am attached to it .. i purchased it at the Apple Store for $1500 or so in the Spring of 2006 and used it for about 2 years only .... it has been idle mostly as I use macbooks...

     

    If it just the power supply that sees like an inexpensive fix - but if a capacitor is bad ...  wow i really don't want to go there...

     

    The tic tac noise - was that caused by the faulty power supply? 

     

    I have an install disk jammed in the drive - do you or anyone else know how to remove a disk from this iMac which does not boot?

     

    regards,  Jay

  • emilycat99 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Feb 14, 2014 12:22 PM (in response to YiANNiS-GR)

    Thanks again.  I can definitely invest in a new PRAM battery and see if that makes a difference..

     

    I disassembled everything a few days ago after having watched a video on YT. I had actually bought a new HD thinking that I could just pop that in. Of course the new HD did not have the attachment on the side for heat measurement, hmmm.

     

    I will look  at the 4 diagnostic LED's also.

     

    Of course I had also recently upgraded to the 4 DRAM. and upgraded software to 10.6.8.  It was a nice relatively

    fast machine for a few weeks before it crashed and burned. (i wonder if those upgrades hastened its demise? as in stressed out the capacitors?)

     

    thanks again

  • rccharles Level 5 Level 5 (5,150 points)
    Currently Being Moderated
    Feb 15, 2014 11:53 AM (in response to emilycat99)

    but 10.6 will not run on a g5.

    upgraded software to 10.6.8.

     

    Find out what machine you have.

     

    This site provides more information.  Best for older machines.  Note, serial number is sent in the clear.

    "A serial number is a unique, identifying number or group of numbers and letters assigned to an individual piece of hardware or software. It's used for various things depending on the product / brand but what is your Mac's serial number for and more importantly... what is it hiding and what can it do for you ?"

    http://www.appleserialnumberinfo.com/Desktop/index.php

     

    or

    This site provides more information, but lacks security too.

    "A serial number is a unique, identifying number or group of numbers and letters assigned to an individual piece of hardware or software. It's used for various things depending on the product / brand but what is your Mac's serial number for and more importantly... what is it hiding and what can it do for you ?"

    http://www.appleserialnumberinfo.com/Desktop/index.php

    http://www.chipmunk.nl/klantenservice/applemodel.html

       ( hint by K Shaffer  )

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