IMac powered off while in use and won't power up, surge protected

iMac DV suddenly lost power while in use and will not power up. I've played with the power cord and reset button etc. but it's as thopugh it died of old age. Any ideas? Could it's internal battery cause this ? Where is it?
Is there a way that I can download from the hard drive without power?

Before you trash the Imac, I would get a new internal battery and try that and if that doesn't work I would try to get a new power supply, that sounds like the problem.
Also if you have another mac you can take the hard drive out of the dead Imac and put it into the other mac and get your important files off of it. HTH,Aaron

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My neighbor's computer is experiencing some problems: it does not start (the screen stays black, no startup chime, but the fans run, as does the hard disk. Also, neither the mouse or the keyboard seem to be powered (no light), so the computer doesn't even come to loading the EFI). The model is an iSight iMac G5 20'' (EMC=2082).
I have tried usual commands (reset PRAM and reset the SMC). Also tried with no device connected. (well, if something so trivial than all these tips did the trick, I wouldn't had to ask here ).
So, without keyboard, I couldn't even try special modes (safe, target disk, start from CD, etc), should the Mac be able to start in some mode. I have then decided to open the iMac (well, the warranty is way out, so nothing is lost). I have never seen a so-hard-to-open Mac, by the way (something was likely blocked).
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-the RAM is an obvious possible cause;
-the CPU is also obvious;
-another component on the main board/logic board.
-I have forgotten a 5th point?
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First, about the RAM, it seems the RAM slot is empty, so the actual RAM is somehow built-in (I haven't seen something seeming like usual RAM bars), so, if I can't remove the RAM, how can I test whether it's damaged or not?
Then, the CPU. There are 2 of them. So I thought I may take one out (and then the other one) and see whether the Mac starts. Well, I can't figure out how to remove the CPU cooling piece (there are just 4 "buttons" that can be pressed but nothing happen). I prefer asking here first, not removing the entire main board without advices.
Lastly, if it's the main board, I know I won't be able to do much. I have read there are LEDs to possibly diagnose power issues, but I don't see them (no LED is showing light, it seems). I'd like to test my other assumptions before thinking the main board is the cause.
Else, is there something I could try I have forgotten?
P.S: sorry for my (possibly) bad english, and the troubles of explanation; it's not as easy when english isn't the native language. I just wanted to mention that I have already repaired computers, so don't hesitate to tell me complicated answers.
Thanks in advance for your help.

spudnuty wrote:
Hello,
Anic,
You can't remove the CPU nor remove/replace the RAM… Really a bad model!
Yes you have to think of it more like a laptop. The only models w/ removable CPUs were the Towers.
Which explains why I thought CPU were usually removable (I have mostly used towers except the original iMac, before).
Thanks. I indeed never touch a board when the computer is plugged.
Hee hee I did since I was used to working on the ALS model where the power supply is enclosed.
Even on an enclosed power supply, I'd not want to touch some kind of board. Well, perhaps it's just me.
Actually, it's the info about which info I need that I'm looking for
After having tried what I could, the remaining bits seem locked (unlike other models).
Not sure what you mean here?
Well, after re-reading myself, I agree I don't really understand either
I meant that I have already tried as much as I could, but the remaining bits (so to mention, the RAM and CPU, mainly) can't be tested. So, I'm looking for testing other parts of the iMac (perhaps there's other things that can be tested, like flashing the EFI).
I'd like to hear from you that the built-in RAM can't be tested, please (to clear my assumption).
the external screen adaptor..(if it wasn't optional, then she does not know where it is).
Well it looks like this. It's pretty standard. Every iBook had one for instance.
http://www.synaptech.com/catalog/images/922-4554.gif
In fact, all the laptops I have seen have that kind of adaptor (although they may slightly vary from models to models), but I thought it was only for laptops (which, as they are easy to move, may have different available screens). Now, does it also apply to iMacs?
I have a question regarding this: I guess the LED3 is concerning the whole graphic card, not just the built-in output, right (in other words, not just about the "main" display)? So I doubt an external screen would make any difference since the LED3 is off (tell me if I'm wrong).
Well what the manual says is:
"LED 3: Indicates that the main logic board has established communication with the LCD display."
So if that's not light then the graphics chip is not communicating with LCD panel.
Fine, but can the graphics chip still communicate with the external port, even if the LED3 is off?
(sorry for having been unclear)
So you did a SMU reset like this:
"Resetting the SMU (System Management Unit)
1. Unplug all cables from the computer, including the power cord.
Wait 10 seconds.
2. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
3. Let go of the power button.
4. Press the power button once more to start up your iMac G5 (17-inch iSight).
Hmm… Not sure about step 2. The "simultaneously" part may not be what I did (I actually tried two things:
1: plugged back the power cord, then (after that) pressed the power button
2: while still unplugged, I pressed the power button (held down for about 5 seconds), then released it and plugged the power cord back.
Do you think I should press the power button while the iMac is still unplugged and keep the button pressed while I plug the iMac (then release the button after I have plugged it)?
If that doesn't help you really need that Mini VGA to VGA adapter so you can plug in a standard VGA monitor and check out the output of the graphics chip (GPU).
I'm glad you mentioned every iBook has one, since my sister has an iBook
I'll ask her.
Since it's not communicating with the LCD it could be a cable problem.
I'm doubting of that, because I'm sure the Mac does not boot at all (not just a blank screen, but also no power on USB ports).
Also you should read through this site:
http://jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php
Which concerns the "capacitor plague". I'm sure you're aware of this. We had 30 Dell P-IVs that had this problem and those logic boards had a ton of lytics on them.
Hmm… What a charming surprise
Well, I'm indeed aware of this (it hasn't happened to me yet, fortunately).
Thanks for the link.
As to the rest of your questions, answer this set first.
Fine, I follow the guide
Thank you.

IMac powered off while in use and won't power up, surge protected

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