13 Replies Latest reply: Oct 30, 2011 3:58 AM by Ame RiCK
Lance Mcvickar Level 1 (100 points)


My Mac Pro is having boot issues,It occasionally gets stuck when I turn it on and the fans go up a bit then I just get a grey screen, sometimes just shutting down and restarting works and sometimes not. I repaired the disc though it says has no issues and repaired permissions. It still does it. if I hold down the option key and boot and select my system drive then it boots fine. Once up and running everything seems fine it wakes from sleep no problem but after a shutdown it sometimes will not boot, it's almost 50 50 chance at this point that it does not boot. I can try booting off and older back up and see if it happens. I do have two video cards and 12 gigs of ram but not sure when this started to happen but it seems to be happening more often lately.

The Mac Pro warranty is over, taking it in for service is not an option at this point. I will install Snow Leopard on a new drive and see if it still happens as a test.

MP 2008 8 core 2.8,mac mini hdmi, iPhone4,ipad,ATV2, Mac OS X (10.6.5), 8 gigs ram, running three montitors
  • Lance Mcvickar Level 1 (100 points)

    I saw someone said it could be the battery on the logic board running out of juice, any thoughts on that and where would I get the replacement, Radio Shack? Amazon?

  • jamesr57 Level 1 (15 points)

    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.

  • Lance Mcvickar Level 1 (100 points)

    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.

  • TStam Level 1 (75 points)

    Look at your power light. Is it flashing? If endlessly flashing, this happened to me - bad memory stick. Find it by process of elimination or led's on memory board.


    Might also be a bad video card.


    Good luck

  • Lance Mcvickar Level 1 (100 points)

    No not flashing, just on like normal, I did have that issue once and it was a bad ram chip.

  • Ame RiCK Level 1 (0 points)

    Hi Lance,

    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?


  • Lance Mcvickar Level 1 (100 points)

    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.

    Good luck.

  • The hatter Level 9 (60,925 points)

    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.


    Heat kills.


    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....

  • Lance Mcvickar Level 1 (100 points)

    Well heat most likely has something to do with it and time, two video cards and four drives makes for a hot mac,

    CPU temp is 88 expansion slots 90 but those temps should be ok. Dust is also a killer....


    Hatter do you recomend SmcFanControl, I do not have it installed.

  • Ame RiCK Level 1 (0 points)

    I have just installed iStat pro and here are the specs:


    Fan section:

    Exhaust Fan : 600 rpm

    CPU Fan : 500 rpm

    Power Fan : 600 rpm

    HD Fan : 800 rpm


    Heat section :

    HD1: 82.4°

    HD2: 77°

    CPU A:84.2°

    CPU A:75°

    CPU B:80°

    CPU B:77°

    Ambient :69°

    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.

  • The hatter Level 9 (60,925 points)

    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

    Direct sunlight


    .... can't help much or enough

  • TStam Level 1 (75 points)

    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?

  • Ame RiCK Level 1 (0 points)

    Thanks The Hatter,


    I've cleaned the fans & Installed this awesome little app "SMCFANCONTROL" , I pushed all the fans' rpm to 1100rpm  and this solved the problem 'For the moment', I didn't experience any shutdowns after that, Hope this will last ........