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Helpful answers
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May 13, 2012 6:19 PM in response to NuestraCasaby Texas Mac Man,Resetting the Logic Board
Resetting the logic board can resolve many system problems. Whenever you have a
unit that fails to power up, you should follow this procedure
before replacing any modules.
1 Unplug the computer.
2 Press the Power On button on the front of the unit.
3 Open the side access panel.
4 Remove the battery from the logic board.
5 Wait at least 10 minutes before replacing the battery.
6 Make sure the battery is installed in the correct +/-
direction.
7 Reassemble the computer and test the unit.
Cheers, Tom
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May 13, 2012 6:25 PM in response to NuestraCasaby BDAqua,Tom likely has you covered.
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
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May 14, 2012 2:59 PM in response to NuestraCasaby NuestraCasa,Thanks for the feedback guys. I have already replaced the PRAM battery yesterday with a new one, but to no avail, and have tried the reset procedure
If the PSU unit has died, would the white LED light come one when I press the power button and the fans "tick" for a second? I can pick up a PSU on ebay for about $40. Maybe a more cost effective solution rather than take it into a shop for a diagnostic as replacement does not look too hard.
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May 14, 2012 4:12 PM in response to NuestraCasaby BDAqua,I'm not 100% positive, but I think the LED just means it's getting the 5 VDC startup voltage, not necessarily the other voltages.
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May 14, 2012 5:59 PM in response to NuestraCasaby NuestraCasa,I have tried the various shut down/smu resets but no luck. Noticed something very strange though. When I plug the power cord in and I hear the relay click, the white led comes on momentarily. Is that normal.?
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May 14, 2012 7:24 PM in response to NuestraCasaby Cathy Dillon,Hi - I just wanted to share my experience - so far -- with MY dead or Dying imac G5 which was new in 2006.... I feel confident that a local affiliated apple store will be able to rescue my data..and just transfer it to a new $ 1199.. desktop mac . The aging computer would not turn on & behaved like a car with a completely dead battery.. not even any clicks. I have had trouble turning it on before, if i actually 'shut down' instead of 'sleeping' but some combination of the 'normal' easy tricks worked up until today... my screen has been developing those vertical lines for quite a while now-perhaps as long as 2 years.....I stopped counting at about 14 vertical stripes. My "aged" G5 is having trouble keeping up with the times, and, for example can not download the recent/ current free adobe reader. I guess I am running "tiger",OS 10.4 . something; as leopard was my daughter's OS and she skipped over "snow leopard" . last summer when getting a new mac book pro. The guy at the shop does the diagnosis for free, but i got him to just TELL me ( without looking under the hood) that the vertical lines problem, combined with the start up trouble and the history of recall/ repair /replacement with the logic board/ model of the computer could mean that the logic board has 'gone bad'.. and a replacement @ about $200- would buy you maybe 6 months..and that is while apple/ things/ everyone is rapidly moving on to 64 bit whatever; and I am still stuck with the aging platform. Many many items i am willing to repair, but I think I will just go for it- a new one -this time. I hate even more to spend money and then some more money on multiple smaller possible solutions that don't work. IF he discovers that all it needs is a new internal battery or something, it can go to my motherinlaw, and then money will have been well spent. good luck to all. fingers crossed for the survival and 'migration of my data!!