At any point are you having issues with NO VIDEO? Do you have the ATI Radeon 2600 HD XT video card? If yes to both, check out http://support.apple.com/kb/TS3630
Had issues with booting 5 of 9 Mac Pro systems. Turned out to be the ATI Radeon card. It's quietly being recalled until July 31.
Hi Jamesr57, I do not have the 2600 xt installed but I do have one and would much appreciate the link to the
recall so I can get whatever they are exchanging it with.
Second I have the Radeon 5770 and the Geforce 8800 installed, perhaps its the 5770. But they both seem to be fine. Not sure if the booting issues started when I added the 5770 so I guess I will pull it and see if it makes a diff. I used to have the 880o and the 2600xt without issue, but the two ATI cards did not play nice together.
Thanks for the reply.
I'm having the same problem as you. This happens to me when I changed my ATI RADEON HD 2600 xt CARD (The first card was also an ATI RADEON 2600 card with no video,I've cheked the article and found thats a manufacturer's problem...).
I did SMC reset, hardware test, then to the Apple center, after 1 week of test the guy told me that they didn't found anything and by "elimination" it "could" be the motherboard.
Its realy random when it chuts down, I can work for 4 hours whitout any problem but sometimes it happens avery 20 min and sometimes it won't start at all after it turns off (I have to wait for 10 min or so).
Did you solve the problem? How?
Well my Geforce died but I don't think that was the issue. At almost the same time four of my one gig OWC ram chips that were three years old died, the original chips shipped with my mac pro still work. I also have 4 two gig OWC chips that are working fine. It seems my one gig chips were all dying, first the video card then the one gig chips, one after the other.
Perhaps you should pull out some ram and see what happens as it's an easy test, if you just pull one pair of chips at a time and see if the issue goes away. The little power light should blink on the mac pro when the ram is bad, but it seemed mine were still sort of working and causing the boot problems without showing the blinking light although it did do it once and then I looked at "about this mac" and saw i only had eight gigs of ram showing up instead of the12 gigs that were installed. I have a ATI 5770 installed now and the 2600xt and have no boot issues any more so it was not the 2600xt.
So it seems it was bad ram in the end and now my mac boots everytime no issues.
I wonder if heat contributed. If you weren't using SmcFanControl wisely.
Ventilattion and placement, location, as these things are designed more to run quiet, they put out enough heat to warm up my office.
FBDIMMs are a common issue over time, and with OWC either because they are sold and used by people here on forum, or by design....
I have just installed iStat pro and here are the specs:
Exhaust Fan : 600 rpm
CPU Fan : 500 rpm
Power Fan : 600 rpm
HD Fan : 800 rpm
Heat section :
Slots : 84°
I don't know about the average Heat and Fan speed on the Mac Pro (early 2008).
I've noticed that when it shuts down the front led of the MacPro is still powred on but there is no activity on the HD and thus no boot.
88 * C is HOT
Hard drives are not much of an issue, even 4, though I don't like now that WD Black tend to run 40-42C.
I recommend everyone run SFC regardless. It should be a REQ'D background app!!!
That and Temperature Monitor or iStatPro.... but on the whole only use the minimum and no duplication, not even for checking SMART health status. "less is more" or the olde "too many cooks" approach - your system runs better, even faster, and less trouble.
Kicking the fans up 400 rpm makes a significant change in temps. But of course if it is
Pushed in corer
Up against wall
No air flow
.... can't help much or enough
The failure rate is increasing. Heat is a good suspect and as well as cleanliness should be managed, but no one has suggested power supply. Have you had it checked? Is your power supplied through a UPS and clean? Are you overloading your outlet causing a brownout condition? Low voltage, dirty power, or spikes can wreak havoc and toast video cards, memory and other components. Coincidentally, has your home been hit by lightning recently or experienced power outages?