Machine boots, yet screen remains dark and I get no feedback

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Power Mac G5

PowerMac G5는 Apple Corporation에서 2003년에 처음 제조한 데스크톱 컴퓨터입니다. 이 안내서는 2004년 Apple PowerMac G5 모델 번호 A1047 EMC 2061의 수리 과정을 검토합니다. 2006년에 먼저 개발자에게 그 후 소비자에게 Intel 스위치의 일환으로 판매가 중단되었습니다.

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Josh Calvetti @josh

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게시일: 2011년 1월 14일

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Machine boots, yet screen remains dark and I get no feedback

So, I built a franken mac from a pair of dead Macs. One had a dead logic board, the other had a dead power supply. Or at least so I was told. Once all was said and done, I had a machine that would turn on, but it seemed to have some quirky freezing. So, I opened it up and reseated the processors again. Now, when I turn it on, I hear a click from the power supply, the fans kick in, and the machine turns on.

However, I never hear the chime. Nor does it seem to respond to any keyboard input (though it's hard to say exactly). Yet my monitor (17" Cinema Display with ADC port) receives no signal. The power button on the monitor works, but nothing happens to the panel itself.

Now: Is this possibly a video card issue? Is my power supply dead? Did the logic board go?

Any guesses would be greatly appreciated!

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

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UPDATE: So I tried swapping processors. Upon having done this, I plugged in the power. There was a brief "Click-click" from the supply, and nothing. I pressed the power button. The white LED lit as long as I had my finger pressing the button in, but after that, there was nothing. Occasionally, there will be the same click-click sound.

Is the machine screwed?

Josh Calvetti 의 2011년 1월 15일

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Ken @mactechplus

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I feel your pain. I just finished repairing 5 of these gems this past month. Only one was easy. The one that had the type problem you are having had a processor issue. I switched them around and for some reason the machine came to life. (still have no reason why but it is still running) I did have to put new RAM in this machine also as I got the three blinking lights when it did respond.

If your other machine is in same year group and same speed you my try moving the processors over from it and see what happens.

Good luck with it.

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Here's something I forgot to mention; on the space for the processors, one of the tiny little pins is a darker color than the rest. To be honest, it almost looks like it was sharpied. Any clues?

Josh Calvetti 의 2011년 1월 14일

That could have been a short that occurred and now it's dead.

Skippy722 의 2011년 1월 15일

+ Doesn't any body give up votes for good answers anymore?

mayer 의 2011년 1월 15일

So, I swapped processors 0 & 1, and the machine popped to life. It only reports one core, but I'm really okay with that.

Josh Calvetti 의 2011년 1월 17일

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UPDATE: So I tried swapping processors. Upon having done this, I plugged in the power. There was a brief "Click-click" from the supply, and nothing. I pressed the power button. The white LED lit as long as I had my finger pressing the button in, but after that, there was nothing. Occasionally, there will be the same click-click sound.

Is the machine screwed? — Josh Calvetti
Here's something I forgot to mention; on the space for the processors, one of the tiny little pins is a darker color than the rest. To be honest, it almost looks like it was sharpied. Any clues? — Josh Calvetti
That could have been a short that occurred and now it's dead. — Skippy722
So, I swapped processors 0 & 1, and the machine popped to life. It only reports one core, but I'm really okay with that. — Josh Calvetti

Andrew @andrewjtaylor 평판: 59 5 3 · Answer 1 · 2011-01-25T20:05:11-07:00

Hey guys,

I had a problem that sounds similar that I just solved a few minutes ago, thanks to the amazing resource that iFixit is which led me on the right track after looking at numerous questions & answers. My machine would power on, but no signal would be sent to the monitor. The fans would run, and would in fact get louder the longer I left the computer on, forcing me to ultimately have to force the G5 to shut down. I removed the memory and the video card, but didn't get a beep or any flashing from the power LED that people said I should get. I've been thinking that my power supply was faulty (given the fact that it is common among G5's), and have been reluctant to foot the $200+ bill for a new PSU. BTW, from my searches, it seems this site has the best prices (http://www.mac-pro.com/Replacement-Power... here to figure out your exact model by serial number: http://www.chipmunk.nl/klantenservice/ap...). Still, $200 bucks isn't really feasible for me. So, I'd read that resetting the PMU/SMU could be helpful. I decided to do that. I followed the basic directions on Apple's site for the process (http://support.apple.com/kb/HT1436), although they don't seem accurate. I have a June 2004 G5, and I definitely have a button as depicted (although the innards are located slightly differently), although it is labeled PMU on the circuit board. Anyway, I pushed the button, turned it on and made the mistake of forgetting to put back in the main fan set, shut it down, put it back together properly, powered it on, and CHIME, I hear the lovely boot sound. A little bit later the monitor powered on and everything was as normal. Don't know if this'll work for you, but it couldn't hurt to try. I'm not sure why, but I've seen it stressed that you should only press the reset button ONCE. Not sure what'd happen if you pressed 2x or held it, but a short click will work. I didn't think i'd pressed it enough, but it worked. Cheers.

Well, as it turns out, I spoke to soon. Last night the G5 crashed with a kernel panic error message in the top-left corner of the screen. Never got one before. From then on I've been trying to get it to boot properly, but it's really hit or miss. I've restarted it several times, had it freeze once at the gray, apple symbol screen, and sound the chimes 2-3 times, but mostly it will just turn on without chimes and without any output to the monitor. I'm really wondering now if it is in fact a power issue. — Andrew

Power Mac G5

Machine boots, yet screen remains dark and I get no feedback

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