imac won't power up!

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Joined: Jan 29 2007
Posts: 2

Hi, this is my first post here, so I hope I'm in the right place (right website, right forum) for what I need. I have an imac that's been having trouble powering on. It powers on fine if it has only been just briefly shut off, but if it is off for any length of time it has problems. It will rev and the l.e.d. light will flash, but it has trouble "catching". Sometimes, if I work and work at it, it will finally catch and power up. But not this time! Right now it's been black screen for over two weeks! Currently, I am not always able to get any noise or light. I tried readjusting the internal power button, which did look out of alignment, but that did nothing. Any ideas?

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Hawaii Cruiser's picture
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Joined: Jan 20 2005
Posts: 1434
May be time to blow taps...

If you've never changed the PRAM battery, you could try that. Otherwise, it sounds like the famous old PAV board problem that eventually plagues so many iMacs. Unfortunately, if it's the PAV, it's basically fatal, since replacement is not worth the expense. Do a search on this site for PAV and you'll find it discussed many times.

coius's picture
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Joined: Aug 25 2004
Posts: 1975
you didn't happen to try installing OS X on it?

sounds like you did without upgrading the firmware...
What revision is this? (bondi, Fruity, DV, Etc..)

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Jon's picture
Jon
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Joined: Dec 20 2003
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The quickest question is, doe

The quickest question is, does it have a slot for the CD drive, or does a tray pop out?

The trayloaders have these symptoms when the analog board is dead/dying.

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Hawaii Cruiser's picture
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Joined: Jan 20 2005
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Actually, I've encountered ma

Actually, I've encountered many slot loaders with the same problem. Of course, I forgot to ask, this is an iMac G3, not a G4, right?

Jon's picture
Jon
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Joined: Dec 20 2003
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Of the slot-loaders I've seen

Of the slot-loaders I've seen with bad PAVs, they turn on, the power LEDs lights up, and they stay that way. From what I've read here,t he tray-loaders will power up and then back off if the analog board is bad.

Of course the OS X question is also very important.

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I am not in this world to live up to other people's expectations, nor do I feel that the world must live up to mine. - Fritz Perls

Hawaii Cruiser's picture
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Joined: Jan 20 2005
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I think you're right. You're

I think you're right. You're a careful reader, Jon.

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Joined: Jan 29 2007
Posts: 2
More on my imac

This imac is a slot loading G3.

The PRAM battery has never been replaced.

I did not try to install OS X.

Where I live there are no repair places for MacIntosh. The closest place is about an hour away, and as a school teacher with 3 small children, getting there is gonna be like planning and taking a field trip!

Any other ideas of what I might try myself before making the trek?

Thanks!

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Joined: Dec 15 2004
Posts: 122
Check this site for battery p

Check this site for battery part numbers and sources.
Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
http://www.geocities.com/texas_macman/pram.html

 Cheers, Tom