Mac Pro Power Up failure - Mac Pro goes on and off

Since few months my Mac Pro first generation (2x 2.66 GHz Dual core 8 GB RAM with ATI Radeon XT1900X 512 Mb video card) frequently does not start up. When pushing the power button it starts up and in few seconds turns off again. I have reset the SMC, done a hardware test for RAM etc. The machine has had a dure test at a service provider but the problem was not found.
Few weeks ago the problem began again and sometimes the Mac Pro starts up normal and sometimes the problem occurs again. And sometimes the Mac Pro goes of spontaniously. Can this be the Video card causing this problem? The RAM seems to be OK, cause I replaced the 4x 2xGB DIMMS with the older 2x 512 MB DIMMS that came with the Mac Pro and the same problem occurs.
Has anyone has this problem and/or knows a solution?

I just starting having this problem today. I turned on my Mac Pro this morning and after a few seconds it shut down and then restarted. It kept doing that so I finally unplugged the computer. Prior to today the computer would sometimes shutdown or restart on it's own but I could usually get it boot back up and was able to use the computer. It's still unplugged and I'll leave it that way until I get home from work today. I did open up the case and blasted out as much of the dust that's built up with a can of compressed air. I've read about resetting the SMC but can I do that if the computer keeps restarting after a few seconds? I have AppleCare for the Mac Pro should I just set up an appointment and take it in? I worried that it may be an issue with the power supply. Any suggestions? I appreciate the assistance!!!
Thanks!!

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This may be a strange place to report this issue (I have posted it in the APC forums) but I am wondering if anyone here has an idea.... because the behavior seems indicative of my iMac cycle awake and asleep again.
I have a Backup UPS NS 1080 made by APC. There is some strange behavior with the controlled outlets since I have upgraded to Mac OSX Yosemite. I have set the threshold repeatedly (twice with the tutelage of APC support folks on the phone). The second time we plugged a floor lamp into the controlled outlet and it went on and off repeatedly after we set the threshold. I have set the threshold both with the computer (a late 2013 iMac) asleep and turned off. Yet, nothing seems to work. APC thought perhaps the unit was faulty and replaced it, but the problem persists with the new unit... computer asleep and the controlled outlet(s) are going on and off. Only a problem because I have the computer speakers plugged into one of the controlled outlets and I can hear the subwoofer loudly "pop" when it turns on and off while the computer is asleep... a pain.
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You could overload the circuit, but your MP has 865W PSU and needs more 1200VA or above.
Don't overload a circuit, and don't have an A/C or your fridge on the circuit. Not sure what you can do or get an extension cord designed for window air conditioner (15A , flat, grounded, and very heavy duty).
Take a look at APC knowledge base perhaps. Or put the fridge on a line conditioner??? more to keep any noise or to reduce the effect of its power cycling. Old? new? check it with one of those Kill-A-Watt devices and see what is pulls.
Take a look and there are excellent threads on UPS all the time. Yes, you need to upgrade to APC's RS1500VA or you could go with the LCD RS1300VA.
Personally, I have an older XS1500 for peripherals that use to handle my G4, and RS1500 that handles MP and monitor, router. Both are on a new circuit but using two plugs on same outlet, but nothing else on this circuit.
Oh, and audio and such... keeping RFI and noise should be essential, no?

My MBP mid 2010 display blackout and froze while working but my keyboard light will still light up. Won't be able to retrieve it and have to hard shutdown. Sometimes it happens a lot. Wether it connected to power or not, it will blackout on and off. Pleas

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Do you have a 15" mid-2010? If so then your problem is surely...
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If you're having frequent kernel panics with your 15" mid-2010, or intermittent screen problems, the problem is, more than likely, the faulty NVIDIA GPU found in a number of those machines.
Here's just a sample of a kernel panic log that points to the faulty NVIDIA card:
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Here's the "official" Apple take on the issue - but the very real kernel panics need not be preceded by 'Intermittent black screen or loss of video'... in fact, you might not experience any video problems at all. Although video problems can certainly be a portent of things to come…
So what can you do? Print out a copy of your kernel panic and a copy of the Knowledge Base article and take them, along with your machine, to your local Apple Store or an Apple Authorized Service Provider. The unfortunate thing is that many people have passed the “three years from date of purchase” now and Apple is not honoring the free logic board replacement for many users. Some dealers seem to be making some exceptions for those past the three year mark, but don’t count on it…
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Clinton

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Since you don't say how old your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
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http://support.apple.com/kb/HT3964
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Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
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How can you watch itunes purchased movies on apple tv. A click on to movies then into purchase thn a click on a movie i want to watch then my apple tv box light starts going on and off plus the screen is blank

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JasonFromSK wrote:
With the newest Airport firmware (7.6.1), it seems I should be able to do this.
Really? I need to check that out!
You should certainly be able to add content by reference to itunes from such a disk (even before the update) - so long as itunes knows the location of the file (set Preferences not to copy to local library when adding the media) it will stream it to AppleTV if the disk is available.
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Okay so I have WiFi problems and I can't seem to find anybody with the same problem as me. I've read many WiFi problems with iOS 6 on Apple Discussion Forums and also Googled it and none of the problems I've seen fit my category.
Infact, my problem is not only with iOS 6 and iPhone. I also have the same problem with my MacBook (2009, OSX Mountain Lion 10.8.2) and also my iPad 2 on iOS 6.0.1.
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Lol you're going to love this... the one reason I wouldn't upgrade iOS on my iPhone was the exact thing that was holding my wifi back? I just feel stubborn now. Anyway. Thank you brandon, for atleast attempting to help.
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Weirdly, I'm not sure it was the iOS update that changed things, as my MacBook is actually connecting perfectly aswell?
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(Now watch it just be my router making me look like a fool.) Because I also restarted it about an hour ago. (Which I have done numerous times in the past months.)
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For anyone that might run into this problem later on, update your phone. >.< New lesson learnt.

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It needs to be dried out. Stop using it.. don't turn it on. Put it in a zip lock bag with some rice or one of those packets of dessicant for a day or two. That might do it.
i
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Hi
After my old MSI GT660 could not be repaired, i recieved a new unit, but with a different screen. However, less than a week later, the left speaker goes on and off, no matter if it is playing a video, music or podcasts. And the right speaker sounds bad, when the left speaker isn't working (like something is covering it). But when the left speaker is on again, it sounds good. It has been on and off 4 times now.
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djmx,
Stop the use of foul language disguised or not.
>> Please read and comply with the Forum Rules <<
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If I have helped you with your problem in some way, please take a little time and hit the kudos button in my post. Without your feedback, I don't know if I am being helpful or should just be put out to pasture.

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Mac Pro Power Up failure - Mac Pro goes on and off

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