Fan just runs at start up

mac pro (about 6 years old)..on latest OS that it can take.  at start up the fan just runs and the light on the front just blinks..nothing on monitor

the light on the front just blinks..
That is an indication that there is not enough good RAM to start up.
Note that in older Mac Pro with memory in pairs, if one member of a pair is not working, both are unusable. So in some cases, mixing and matching may produce a pair that works.

Similar Messages

  • IMac G5 won't boot and fan just runs

    I have an older iMac G5 that has always been a little flakey...it would just shut off for no reason intermittently.  For the most part, I could deal with that as this is no longer my primary Mac, but when I did the last iOS update, my external TimeMachine drive started getting errors - won't write because the drive was read only and now, when I turn on the computer, it won't boot...the fan just runs loudly.
    I researched this and tried the following:
    Reset the SMU - didn't resolve
    Unplugged everything and rebooted - didn't resolve
    So I have a couple questions since I'm ready to toss this computerI have a current Time Machine backup, but don't have a machine to restore to
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    How can I get my iPhoto, iTunes, iMovie, etc. files off the backup and is there a way to import them into my existing applications on my MacBook Pro?
    Any help would be VERY much appreciated!! 

    You may have the old exchange/repair program power supply capacitor issue on your iMac.  You might be able to find another on my FAQ*:
    http://www.macmaps.com/usedrefurbished.html
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  • While I'm charging my mac my fan just started running abnormally loud, what do I do?

    My fan just started to be abnormally loud when I charge my computer. When I unplug the charger from my computer it stops, but I just have never heard the fan run so hard. Is my computer going to over heat every time I charge it?

    Reset SMC
    http://support.apple.com/kb/HT3964
    Choose the method for: 
    "Resetting SMC on portables with a battery you should not remove on your own".
    If this does not help, you may have to take the computer to the Apple store
    to have it checked out.
    Best.

  • I have a new Macbook Air and for the last few days the fan had run continuously, this is the first time it has ever run, and now it won't stop, the fan starts up as soon as I turn it on. The computer is not hot.Any ideas on how I can fix this please ?

    I have a new Macbook Air, 6 months old, and for the last few days the fan had run continuously, this is the first time it has ever run, and now it won't stop, the fan starts up as soon as I turn it on and the computer seems to running more slowy.The computer is not hot but I am worried it may burn out,.Any ideas on how I can fix this please ?

    Hello dwb,
    Here is the screen shot, just the top half, there are another 10 pages, but I guess this should enough for you to have an idea of waht is going on, bit small I am afraid. No, I don't have any apps setup to run when I open my computer, the kernel, varies between 290 and 305 per cent ish.
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    Regard,
    Beauty of Bath

  • Satellite U500-11C fan sometimes doesn't start running Win 7 64bit

    Hello,
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    Hope this feedback can help...

    Hello Tonny,
    Yes, I think like you that when I have this fan issue, it means that BIOS feature doesn't work correclty on regulating temperature with variable fan speeds, and finally, it is the overheating security which makes the job. When using Linux, I've seen that ACPI temperature levels are not correctly defined or published by the BIOS : Fans are not expected to be launched before the CPU burns at more than 108C !
    What surprises me is that this is a bug in the BIOS that has been living here since the first BIOS versions, and that my researches on various forums show that this Satellite U500-11C is not the only one to have fan issues from Toshiba Laptops on both Linux and Windows.
    That said, I don't understand what Toshiba tries to do when making special BIOS versions, instead of using more standard ones with correct ACPI functions programmed inside. Other laptop manufacturers are more "standard" in their approach, and give users more satisfaction on everyday use.
    In the same idea, I've finally removed most of Toshiba applications on one of my two Satellite U500-11C and it runs much better : lower power consumption, less heating, more responsiveness, ...
    Hope this helps...

  • Mdnsresponder will not quit.  Consumes above 100% CPU and kills my battery.  Also causes my fan to run constantly and my computer to get extremely hot.  Force quitting doesn't work.  It just comes back.

    The mdnsresponder will not quit.  Consumes above 100% CPU and kills my battery.  Also causes my fan to run constantly and my computer to get extremely hot.  Force quitting doesn't work.  It just comes back.   I posted about this earlier and never got an answer.  Somebody, please help. 
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    mDNSResponder is a background process that runs all the time. If you kill it, it's relaunched automatically.
    Please launch the Console application and select "system.log" from the file list. Enter "mDNSResponder" (without the quotes) in the search field. Post a sample of the log messages in the Console window -- only one example of each repeated message, please.

  • HT1349 When I start my I Mac desktop the fan keeps running loudly.  Can't get it to turn off.

    When I start my I Mac desktop the fan keeps running loudly.  How do I get it to stop?

    Hello there, Jacquefromaz.
    The following Knowledge Base article reviews the steps to perform a reset of the System Management Controller (SMC):
    Intel-based Macs: Resetting the System Management Controller (SMC)
    http://support.apple.com/kb/ht3964
    Thanks for reaching out to Apple Support Communities.
    Cheers,
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  • I'm wondering if anyone else has had problems with their imac fans being extremely loud when running at slow speeds?  When the computer heats up enough for the fans to run at higher speeds they quiet down. New HD fan was just installed.

    I have an imac that I've had for a couple years.  The fans have always been loud when running at the slower speeds.  When the computer heats up enough for the fans to run at a higher speed the fans quiet down.  I had installed SMC fan control after multiple attempts with Apple to get the fan issue resolved.  That seemed to keep the fans quiet enough.  I've never had a problem with overheating.  Recently the fans were becoming loud again even running at the slightly higher speeds so I took it to my local Apple store and they replaced the hard drive fan.  I got it back and it's now as loud or louder than ever!!  And, now SMC fan control won't "stick."  The fans will speed up, but then gradually go back to the lower "loud" levels.  I'm at a loss as to what to do next. 

    Thanks jared,
    I'm still dealing with this issue through Apple. Some time after I posted this, I contacted Apple again. They did start a case up for me, as I was experiencing the same behavior on two different machines, with two different versions of Windows.
    So far it remains unsolved. I've logged iClouds for Windows on my desktop, which is brand new, then logged for awhile after completely uninstalling Norton Security Suite, depending on the Microsoft security for some time, and finally logged after I uninstalled iCloud for Windows, restarted, installed a clean download, and connected using a completely different test account, which Apple set up for me. None of this made any difference. Looking at the logs, it seems every 10 minutes, iCloudServices.exe creates a new TCP connection to confirm I'm using less than 5GB on iCloud, (which I am by a good margin, using less than 2GB), it seems this connection is not closed, and when the next iteration rolls around 10 minutes later, a new TCP connection is created. I come very close to having 6 TCP connections created per hour, until I restart my computer. This works out to... 6 x 24 = 144/day.
    Perhaps the article you posted will shed some further light on this. I'm thinking seeing the state of the connection through netstats, at the least, could help.
    For the last week, I've been putting a hold on further logging, as Apple wants me to create a new user account on one of my computers, install iCloud for Windows there, and log it running in the other account. This however basically means I cannot use my computer for a fair number of hours, and I've been busy enough with work the past week that I haven't the time or energy to afford to set this up and run it. I've had need of my computers too much for the past week.

  • Fan start and keep running until start the computer again

    when shutdown the iMac the fan start and keep running until start the computer again

    That's odd. Have you tried resetting the SMC?
    Shut down the computer.
    Unplug the computer's power cord.
    Wait fifteen seconds.
    Attach the computer's power cord.
    Wait five seconds, then press the power button to turn on the computer.

  • Macbook fans running from start up

    My Macbook is about 5 months old and I noticed that since a few weeks ago, when I turn the Mac on, the fans start to run. But the Macbook is not even hot or doing something heavy, like exporting from iMovie. The sound is not loud at all. I downloaded a Dashboard widget about fans and it says the fans are running at "18-20" speed. I'm not sure it has affected the battery life, but it must have.

    Hi.....you might want to open Activity Monitor (Utilities folder)....from the first window choose (CPU)....from the top of that window click on the drop down menu and choose (All Processes)...look for a process using double or even triple digit CPU%.....if something is stuck/hung you can quit the process from there...
    You might also want to try an SMC reset....
    http://support.apple.com/kb/HT3964

  • T410 - 252226G slow start, fan keeps running, BIOS config hangs

    Windows 7 Prof FP1, 80 GB SSD. 4GB Ram
    Some strange unusuall behaviour:
    1. It takes up to 45 seconds before the ThinkPad Screen is shown when starting (latest 1.45 bios version)
    2. When T410 is closed down using W7 system power off;  the fan keeps running until the battery is empty. When de/attaching the charger in this stage the T410 beeps like it's still running
    3. When choosing 'config' option in BIOS the T410 hangs
    Any clue?

    I would do a BIOS reset. If your T410 has no supervisor password, then remove the BIOS battery, leave it out for a couple of minutes and then plug it again.
    When the T410 boots, go to the BIOS, press F9 to load the default values, save and re-start.
    Hope this helps...
    /L40SX/240/240X/2*340CSE/360PE/365XD/380D/380E/380XD/380Z/390/560E/560X/2*570/2*600/600E/750Cs/755C/760CD/760EL/760XD/770E/A20p/A22p
    A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T4x0x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/10*X2xx/2*X200T/4*X30x/Z60m/3*Z61x
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  • IMac fan running loudly, started suddenly yesterday

    I've read through the forum and tried resetting the SMC and PRAM. Didn't do anything. Anything else I can try before I make an appointment at the Mac store? I really HATE not having my Mac at home...
    History: Had iMac for ten months, never an issue. Yesterday midday my computer fan started running high. I installed the iStatPro widget, got this info, then realized I haven't a clue what this info means:
    CPU: 1197
    Hard Drive: 5907
    Optical: 998
    Obviously the Hard Drive fan is running five times the rate of the others, but is that abnormal? How abnormal is it?
    The temps run:
    HD: 92
    CPU A: 95
    CPU Heatsink: 97
    Airport Card: 131
    Ambient: 72
    GPU: 108
    GPU Diode: 112
    GPU Heatsink: 112
    Thanks for any info you can give me

    Before taking off to the Apple Store try doing a SMC and PRAM reset again following:
    1. Turn off your iMac and unplug everything from it for 30 seconds.
    2. Plug in the power cord, keyboard and mouse only.
    3. Press the power button and immediately hold down the Option, Command, P & R keys until you hear the second gong then release the keys. Your machine will start up normally, then check for the issues you are having.
    BTW, if your don't have it already I would suggest getting AppleCare, it extends your telephone and parts and labor warranty to 3 years from the original date of purchase. If you do already have it when you call Apple ask about on-site service, they will provide it (if you ask) assuming you are within 50 miles of a service center.

  • I just took in my macbook to the apple store to clean the fan because it was starting make a little noise but instead of making it stop it sounds like an airplane about to take off all the time, it doesn't matter what i'm doing. I dont know what to do now

    I just took in my macbook to the apple store to clean the fan because it was starting make a little noise but instead of making it stop it sounds like an airplane about to take off all the time, it doesn't matter what i'm doing. I dont know what to do now? any ideas on how to make it stop?

    take it back asap.  If it wasn't doing it before they cleaned the fans, they may have accidentally done something that is causing this behavior.

  • Just had my mac mini's superdrive replaced by Apple, I have it back now and the top get so hot you cant touch it, I installed fancontrol and it climbs to 100 C but dont think the fan is running as it says 000rpm?

    Just had my mac mini's superdrive replaced by Apple, I have it back now and the top get so hot you cant touch it, I installed fancontrol and it climbs to 100 C but dont think the fan is running as it says 000rpm?

    Have you spoken to whoever replaced the superdrive? Why not take it back there?

  • I just had the seagate hard drive replaced and the fan is running loud

    I just had the seagate hard drive replaced and the fan is running loud

    Is your iMac a late 2009 or newer model? Did Apple do the replacement or someone else? There is a documented issue where Apple changed the hard drive heat sensor from outside the drive to inside. If you install a replacement hard drive in a late 2009 or newer iMac that's not an Apple-sourced drive, two things happen ... the fan runs like crazy and the Apple hardware test doesn't work properly.
    You can read these OWCS blogs here and here on it. 

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