There's no way to run a diagnostic on the power supply while it is up is there? You can see why I don't have a good feeling about where this computer is headed. I took the computer to a certified Apple repair shop and they confirmed that loud noise I heard and the smell was the power supply failing and it actually shorted out the logic board and processors as well. I had a similar computer Dual 2.0 GHz G5 that had a power supply issue. Now that it is up is there any investigating that I can do? Since this is a reoccurring issue that seems to be appearing more frequently, my concern is that I have not fixed the issue but instead just got lucky on this start-up. So I guess my new question is now that it's actually started up is there a way to check error logs to identify the issue or is there really no way of knowing. To give you a few more details, when I was trying to get it to start yesterday I had the same set-up as this morning.ġ) Plugged directly into the wall to avoid any potential UPS issuesĢ) Only the Mouse, Keyboard and Monitor were plugged inģ) I put in a fresh 3.6 V Lithium LS 14250 C batteryĤ) Tried the SMU reset button a few times during my failed attempts to Then wouldn't you know it the screen lit up and the computer started up. Much to my surprise not only did I hear the click and fan rush I heard the chime. I plugged it back in so I could try press the button and answer your questions. Well, I came in this morning after leaving the computer unplugged all night. Thank you for the quick response, much appreciated. These things can be maddening at this stage of the game, because there are many potential causes, and we just have to try a number of things before we find what has caused the upset. Let the whole thing sit for at least an hour (though sometimes an overnight soak is needed).Disconnect the AC power cord from the back.When you actually press the power button, do you hear another click?Īlso, you should probably disconnect all USB and Firewire peripherals except mouse and keyboard.Īre you on a UPS? Do not discount that causing mischief as well of one sort or another.įinally, one thing to try that sometimes helps in the troubleshooting is to do the following things: You should hear a quiet click as the relay opens or closes as power is removed or applied. You can tell that by listening when you plug and unplug the power cord. I would have to guess, because you do have the little searchlight on over the power button, that at least the power supply is coming up into standby mode. (Do it outside unless you enjoy foul language directed at you by a cohabitant.) Canned air will probably do the job, though when I last did it, I used "shop air" from my compressor.Īlternately, you can also accomplish nearly the same thing without removing the power supply by directing canned air into the fan openings, again doing thatĮven if the problem returns, this little exercise has significant value, but it may in fact clean the problem up (so to speak).īut in any event, we must watch and wait.ĭo you get the "fan rush" after you hit the power button? If you are not hearing that, then you may indeed be dealing with a failed power supply. Once removed, a good compressed air blowout into the little fans on the front will produce a monumental dust storm, in most cases. For representative information, check out the guide for G5 power supplies:
The best way to do that is to remove the power supply (a bit involved, perhaps a little more so on your machine. How long has it been since dust was blown out of the power supply? A long time? Then that needs to be done. Now, what to do in the meantime? That depends. The unfortunate answer is that we have to wait and see. Of course, we all worry that it will be short lived. OK, good to hear that you got it back to life. I tried resetting the PRAM but obviously it had no effect at all since it doesn't even chime the first time. At this point I fear perhaps a power supply or even worse logic board. Still no chime, black screen, the led light stays lit (does not blink a pattern) and the computer does not boot. I put the new battery in and tried starting the computer. I went and bought a fresh battery since the one I swapped out was also probably 6 years old. Black screen again but this time no chime. This time when I pushed the power button I got nothing. I shut the computer back down to see if this was just a coincidence. Thinking it may be the CMOS battery (since the problem seems to be getting progressively worse) I put one in from one of my other Macs. When it wouldn't boot, I turned it off by holding the power button. This has happened to me a few times before but normally it finally boots after trying a few times. This morning I tried turning it on, I heard the chime but the screen stayed black.
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