MAC Mini: fan ran at full speed on power on - advice please

I powered my MAC Mini on as normal today by pressing the power button on the back of the unit, but rather than the light coming on at the front, the MAC started up, but with its internal fan running at full blast - no front panel light. It seemed to be booting (Apple logo and so forth on the normal grey screen) but I powered it off at the wall socket, then on again after a couple of seconds via the rear power button, and normality returned. Anyone got any ideas whet might have happened? Could I have held the rear button for too long? I couldn't see anything in the logs once the machine had booted.
The MAC is an Intel model with 1GB memory installed. It's a couple of months old, running MAC OS 10.4.10 Update 1. Other than a panic caused by an SMB dismount problem soon after I got the machine the system has been fine since new.
TIA
Clem

Welcome to Apple Discussions!
The experience you've had with your mini isn't a common one, but it has been reported from time to time, so it's not unheard of. I don't think there's been a clear reason found for this happening, and there is certainly not one from your description of this specific incident, but among the users I have who run Intel minis, I have had one where a boot failure occurred - the power light failed to light, though the chime was present and the system commenced startup then kernel panicked. An SMC reset was done and it has not happened again - though it may be purely coincidental that it hasn't happened again.
I would suggest that since you switched power off at the wall before rebooting, it would be wise to check you didn't inadvertently damage the drive's data structure or directories - not likely, but possible if the drive was attempting to write at the time, and then do an SMC reset. If you get any other similar events, post back, with as much detail as possible, including any odd behavior you may have experienced in the previous use, and what software you've installed.
To check the drive, run Disk Utility (in Applications>Utilities), then select the internal drive and firstly, click 'repair permissions', then once done, click 'verify disk'. Errors in the permissions will be repaired, though any in the process of verifying the disk would indicate the drive needs a repair which can be tried by booting the system to the original install disk (holding the C key down during startup) and running Disk Utility from there, this time clicking 'repair disk'.
To perform an SMC reset,
-From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
-Unplug all cables from the computer, including the power cord and any display cables.
-Wait at least 15 seconds.
-Plug the power cord back in, making sure the power button is not being pressed at the time.
-Then reconnect your keyboard and mouse to the computer.
-Press the power button on the back to start up your computer.

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Mac Pro Fan runs at full speed!!!!!

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It was definitely not "quiet" as people have mentioned.
I remember all of the logic board issues with bad G5's in the past and am wondering if I have a dud. Anyone else experience the same issues?
-JK
2.66 Dual Mac OS X (10.4.7) 1 GB ram

My 10K Raptor took a week to 'settle in' (or get burned in) and it did seem to cause a hum from the case. Took out the Raptor, no hum or vibration. I also made sure it was seated tightly, and moved it to slot #4.
I ran a 6 hr ZoneBench 511MB test file 30x using 50 "zones" which gave it a good workout. I then ran Disk Utility Erase and under options, chose 7-way write (took a couple hours was all).
Might want to read the review from SilentPC on the 150GB Raptor series.
New Revision, New Noise?
I was ready to put the Raptor in an external case or something at one point (and people probably remember my posts, was a little over a week ago) but someone else told me to "give it time" and just give it a thorough series of tests (like zero the drive at least once). I always load a drive with large disk images when I first get it before putting it to regular use.

Mac Pro, Fans fire up full speed for no reason - randomly!

So, here is another fan issue with the Mac Pro, and I am at a loss. Perhaps someone can help me with this one. I have a Mac Pro I bought in mid '07, dual 2.66 GHz. I have 2 7300GT video cards, which don't have fans of their own to be making the noise...
The computer, when left doing nothing will ramp up full speed for God knows what reason. There is usually almost nothing open for applications, and no major processes running. Menu Meters shows the processor load to be minimal, not a heavy load that would cause heat-issues from processors working hard.
There is really no way to get the fans to slow back down either. The machine is still fully functional, I can open, close or work on software, so nothing is "frozen". I have quit all applications to no avail. The machine will not go to sleep when this occurs, and half the time will not power off using the shut down menu selection either; requiring a forced shut down. Upon reboot, it is fine... (until it decides once again to take off).
This is not the fans roaring when waking from sleep issue, I have had that one as well (bad ram).
Thoughts?

Last night, after I shut down, my fans slowly ramped up into high gear. They went to full rotation, and I let it whirr for four or five minutes, thinking it would shut itself off. It never did, so I just pulled the plug on the CPU. I plugged it back in five seconds later, and it stayed shut down after that.
It's been working more or less flawlessly other than this... most stable Mac I've ever had.

Mac Mini fan increase speed and noise

Hi all.
Quick question. This has been bugging me for a while so decided to get some expert help from you guys.
Lately my new mac mini fan has been operating at full speed sometimes when the computer wakes from sleep and also while restarting or when holding down command and R for the recovery partition. The computer I must say is not suffering any performance issuses or is not under any hard loads.
This is getting very annoying! I have reset the SMC as per apples instructions and it has got better. I am wondering if my external firewire drive is causing problems.
I will explain my hardware set up.
One UPS which is plugged in and the mini runs off that. USB cable from the UPS is attached to the back of the mini. I have one thunderbolt display, one printer on USB, one EYETV USB dongle, Bose speakers plugged into the USB as well.
The firewire drive goes to sleep after 30 mins have elapsed. I guess if I am not using it, eject it and leave the cable from the back of the drive unplugged until I need it again? trying to unplug it from the mini is a chore as the desk space is small.
Any thoughts would be great.
Thanks.

here is a list of wake reasons in the console.
10/03/2014 12:53:57.000 kernel[0]: Wake reason: RTC (Alarm)
10/03/2014 13:54:45.000 kernel[0]: Wake reason: RTC (Alarm)
10/03/2014 14:55:37.000 kernel[0]: Wake reason: RTC (Alarm)
10/03/2014 15:56:25.000 kernel[0]: Wake reason: RTC (Alarm)
10/03/2014 16:57:17.000 kernel[0]: Wake reason: RTC (Alarm)
10/03/2014 17:58:05.000 kernel[0]: Wake reason: RTC (Alarm)
10/03/2014 18:05:25.000 kernel[0]: Wake reason: EHC1
10/03/2014 22:36:12.000 kernel[0]: Wake reason: RTC (Alarm)
10/03/2014 23:41:29.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 00:12:17.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 00:43:10.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 01:43:58.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 02:44:46.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 03:45:38.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 04:46:26.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 05:47:14.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 06:48:06.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 07:48:54.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 08:49:46.000 kernel[0]: Wake reason: RTC (Alarm)
11/03/2014 09:13:42.000 kernel[0]: Wake reason: EHC1
These are mainly when the mac wakes up for Netowrk access as I have back to mac turned on.
I have also included this as well from the terminal output window using:
syslog -k Sender kernel -k Message Req Wake
Mar 11 00:12:17 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 00:12:17 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 00:12:18 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1011 milliseconds
Mar 11 00:43:10 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 00:43:10 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 00:43:10 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 00:43:11 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1016 milliseconds
Mar 11 01:43:58 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 01:43:58 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 01:43:58 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 01:43:59 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1020 milliseconds
Mar 11 02:44:46 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 02:44:46 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 02:44:46 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 02:44:47 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1012 milliseconds
Mar 11 03:45:38 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 03:45:38 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 03:45:38 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 03:45:39 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1012 milliseconds
Mar 11 04:46:26 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 04:46:26 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 04:46:26 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 04:46:27 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1018 milliseconds
Mar 11 05:47:14 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 05:47:14 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 05:47:14 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 05:47:15 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1024 milliseconds
Mar 11 06:48:06 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 06:48:06 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 06:48:06 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 06:48:07 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1026 milliseconds
Mar 11 07:48:54 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 07:48:54 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 07:48:54 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 07:48:55 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1016 milliseconds
Mar 11 08:49:46 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: RTC (Alarm)
Mar 11 08:49:46 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 08:49:46 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 08:49:47 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1020 milliseconds
Mar 11 09:13:42 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: Wake reason: EHC1
Mar 11 09:13:42 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
Mar 11 09:13:42 unknown-28-cf-e9-04-d0-45 kernel[0] <Debug>: AppleThunderboltNHI::prePCIWake - power up complete - took 0 us
Mar 11 09:13:43 Alexs-Mac-Mini kernel[0] <Debug>: AppleThunderboltHAL::earlyWake - complete - took 1010 milliseconds

HELP- mac mini fan just sped up to 5500 RPM

mac mini fan just sped up to 5500 RPM
temps are normal though, no overload to system.

The first thing I would try is to perform an SMC reset on the system:
-From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
-Unplug all cables from the computer, including the power cord and any display cables.
-Wait at least 15 seconds.
-Plug the power cord back in, +making sure the power button is not being pressed at the time.+
-Then reconnect your keyboard and mouse to the computer.
-Press the power button on the back to start up your computer.
If the fan continues to run at full speed after that, does it do so right from power on, or on;y after the system has been running a few minutes?

Mac Mini fan won't turn off (only while powered on)

Unlike some stories i've read while crawling around the internet trying to solve MY problem, it's not that my fan won't shut off EVER. The fan shuts down when i put it in sleep mode or shut down the Mini. No problems there. But while the computer is in operation, the fan runs non-stop.
It wasn't always like this. In the 2.5 years i've had my Intel Mac Mini, it has more and more frequently employed the fan. As of the last couple months, the fan is now in continuous use, as long as the computer is in operation. In addition, all the programs take much longer to load, and i'm dealing with programs crashing (Firefox & Safari far more than anything), Bluetooth not functioning, and the front light on my Mini is out.
As for the fan, the Mini is getting plenty of breathing room...even more than it had before the problem. I also have 22GB left on my Mini's hard disk.
Are all these problems related? Am i really just working on my last thruster here? Is my dilitium crystal just about dead? Is a warp core breach imminent? I do not have AppleCare, and i don't know if the Apple Store would look at it for free if i brought it in. Any help (no matter how small) would be greatly appreciated.
MY STUFF:
Mac Mini - 1.66 Intel Core Duo, 2G 667 HHz DDR2 SDRAM
Iomega MiniMax 1TB external HD (for audio/video files)
Iomega Minimax 1TB external HD (for Time Machine)
OSX 10.5.6

When you start your mini from cold (after at least an hour powered down) does the fan spin up to full speed immediately, or does it start out normally and then speed up after a few minutes or so? Did you have the system open for any reason just before this behavior started?
If you had the system open, it might be something as simple as the fan control cable that is not connected. When disconnected, the fan will run at full speed all the time.
It the fan runs at full speed almost immediately from cold, then it would suggest one of two things: either the system is suffering from something like a loose heatsink, or there is an errant process running that is putting the system under heavy load. You can check that by opening Activity Monitor (in Applications>Utilities) at looking to see if the CPU load is consistently high. If it is, look for a process that is causing it.
If the fan runs quietly at first, and then speeds up, after a few minutes, then it does seem likely to be a heating issue. Aside from making sure the vents around the base and on the back are clear by using a good vacuum cleaner, it's possible there is enough debris inside to obstruct the airflow. If you've opened up the system previously for any reason, now might be a good time to do so again, for a quick inspection and clean out.
I would also perform an SMC reset if you have not already done so:
To reset the SMC on an Intel mini:
-From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
-Unplug all cables from the computer, including the power cord and any display cables.
-Wait at least 15 seconds.
-Plug the power cord back in, making sure the power button is not being pressed at the time.
-Then reconnect your keyboard and mouse to the computer.
-Press the power button on the back to start up your computer.
And to ensure you are not suffering from a range of broad 'tuning' type issues, download a copy of YASU (http://jimmitchelldesign.com/projects/yasu/) and run all tasks. This clears cache files, resets logs files, updates prebinding, performs a permission repair and a few other tasks. After the reboot (which will be slower than usual) your system should run a little better.
... i don't know if the Apple Store would look at it for free if i brought it in....
You can make an appointment at the 'genius Bar' of your local Apple store - they will look at your system for free, and help with a diagnosis. What they generally wont do without charging for it is anything that involves opening the system up. However, it's worth paying them a visit for a bit of hands on work!

My iMac G5 Fans run at full speed when using regular everyday applications.

When using just normal everyday applications such as using about 30 min of Safari to surf the web or maybe something else, my fans run at full speed. I have just got a new logic board replacing my old faulty one. How can I fix the fan problem?
Thanks!

Hi again Miriam,
With more news for you and iMacG5 on the fans go crazy. I just got back my computer from the repair center. After more than a week under observation, the technician told me that they just couldn't replicate the problem. They had the computer running non-stop during all this time, not even allowingit to go to sleeo mode and nothing.
The CPU fan never went beyond 2300 rpm (or so) and never went to sleep mode on and off by itself. Furthermore, they ran all possible tests and everything comes back as OK.
Right now I have a movie running on the background, together with a photo processing software open and other smaller processes and the CPU fan is running at 4361 rpm !!! the temp of the CPU is 66.3 Celsius.
Any thoughts??? It's really making me crazy because the computer was neverlike this and now it sounds like a hair dryer. I emphasized with them the fact that this just started after they changed the logic board and as coincidence after Ioaded the security update 2006_04. The technician told me it may be software related. If the computer doesn't go to sleep by itself, then he recommended to reload the operating system.
Any comments appreciated.
Zwirek

Fans run at full speed

As in subject, my brand new iMac Aluminium 20" 2GHz has a problem: fans run at full speed...
After reset of PRAM or SMC, fans start slowly (1200rpm) but rise ti 3500rpm after few minutes and they don't change until a new restore of SMC.
cpu 3-4%,
no apllication opened,
nothing in dashboard.
What's happen?? I've never had a problem with my mac!
PS: sorry for my bad english, I'm italian!
cerion
Message was edited by: cerion86

Hi, just an update -
I ran the Apple Hardware Test on startup, and it returned this hardware error: 4SNS/1/40000000:TpoP
I brought my machine to the Apple Store where I bought it and they ran their diagnostics and said there was nothing wrong. So when I picked it up we booted it up in the store and the fan was about 1200rpm, no problem. We ran the Apple Hardware Test in the store and it didn't give the same hardware error that I'd had before.
So, I didn't really have any ammunition to press them any further on it and for the last week it's been fine. I had the fan race on me again last night but I hope it was an isolated incident.
As for downgrading to OSX 10.4, I'd consider it but I don't feel that I should have to do that to make my hardware perform correctly.
Re. smcFanControl, I thought the purpose of that is to make the fans run faster/more often, but if anyone's used it to stop them from running too fast/too often I'd be glad to hear from you.
Maybe the 10.5.2 version of the OS will take care of this problem, if indeed a problem exists.

TS1433 Fans run at full speed after computer turns on

Fans run at full speed after computer turns on, and a lot of times while i'm working they suddenly start blowing and won't stop. Tried the reset SMC, nothing happens. Also the unplug powercord-method does nothing.
Anyone?

Exactly what method did you use to reset the SMC, every Mac has different methods and I want to ensure you used the method for an Intel based Imac. The correct instructions are in the iMac SMC and PRAM reset link. Do the SMC reset at least 2X!

Fans Running at Full Speed

I've read elsewhere about "runaway applications" taking over the CPU maxing it out and causing the fan to run full speed constantly. It happened to me last night while I had nothing open except Safari and a couple of Dashboard widgets. I checked Activity Monitor and it labled DirectoryService as the culprit eating up all the processing power. I quit the application and the fan speed slowed almost immediately. I've heard of 3rd party apps causing these problems, but nothing within the OS. Any ideas about what caused DirectoryService to cause this? Running 10.5 now.

deltatux wrote:
Is this only happening on first-boot? (As in you just recently upgraded?) If so, your system is caching everything in your Mac so it makes searching for files and etc. easier in Spotlight (it sounds like the Spotlight process). If not, then I guess it's simply a Leopard problem. DirectoryService is running fine on Tiger.
deltatux
I believe the process related to Spotlight is "mds" and "mdworker" (md stands for metadata), not "DirectoryService". DirectoryService goes nuts for me when I plug in my iPod and copy music over. It never did this in Tiger. I wonder if it's trying to treat the iPod as an external drive with a broken directory tree or something.
What is causing DirectoryService to go crazy, I do not know. I am fairly certain it is not Spotlight.

G5 fans - runs at full speed

One of my MACs (G5 2.0DP) can't slow down - the fans runs at full speed all the time (OSX 10.3.9) - hardware test - PMU - disconnect powersupply - exit single user mode - I think I did all that's in the "book" - but the fans are still running at full speed - all the time.
any ideas?

Hello,
I am not sure if you have the same issue, but I might be worth it for you to read the archive:
http://discussions.apple.com/thread.jspa?threadID=561296&start=0&tstart=0
And here is the end of my story:
Regarding my issue with the fan fan full force, yes it was resolved... but not without fighting for it!
Fortunately the machine was still under warranty, and I left it with Apple care during an oversea trip in August. End of August I picked it up suppositely fixed and after a few hours of work I noticed the same symptoms were still there! You can be sure I made it clear to Apple service I was not happy. I left the machine again for a week and 1/2 and picked it up again. They told me they replace the logic board. Again a few hours of work of testing and this time I could repeatidly hang up the machine. Back to Apple, I told them I didn't want to pick it up until they REALLY tested it! This time they replace the logic borad again, the power supply and something else?...
Anyway since then the machine works just like it did before : great, no hardware system related issues.
Unfortunately I cannot tell you for sure what was the problem: logic board? CPUs? power supply?... and I could not get the information from Apple care, especially I would have been interested in the specific procedure they follow to fix my problem... but for some reasons they don't want to share this information...
I hope your machine is still under warranty... other wise you'll have to weigh the pros and cons to have it fixed, especially if they replace the logic board ($900 I believe) or any other main components...
I hope this help,
Good luck,
David
Dual 2 GHz PowerPC G5 Mac OS X (10.4.8)

G500 fan running at full speed for no apparent reason

I have G500 that worked perfectly for a year now. My operating system is Windows 7 Professional. Yesterday the fan started working full speed while the laptop was idle, I wasn't using it and the software that was running in the background were the usual programs I have been running for the last year. First step was to check the temperature of course, which is normal. Then I checked if anything weird is running in the background and creating high cpu usage, but that was not the case either. What I noticed though was that fanspeed is not recognising the fans or counting their speed. Is it a problem on the hardware? It is really annoying. The speed also fluctuates very often, reminds me of how it should work while gaming and definately not when idle.
Thanks

Hi Zoe,
Welcome to Lenovo Community!
As per the query we understood that you are facing fan issue in your G500 laptop.
Please try to boot the system to safe mode and check for the issue.
Also perform a clean boot and check for the issue, if still the issue persists try to update the BIOS and check for the issue.
Click here for the BIOS update.
Hope this helps. Do post back if issue persists!
Best regards,
Ashwin.S
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Case Fan Running at Full Speed

I accidentally shorted the case fan circuitry on my HP motherboard (explanation below) and now the fan runs at full speed all the time. Other than the fact that is was a stupid thing to do, will it be a problem long-term and should I try to reset the fan speed switch?
(Long Version) It is hot around here these days and my computer fans seemed underpowered. I put a splitter on the case fan outlet on the motherboard and added a second fan in addition to the original fan. It all worked fine except the new fan seemed to run pretty slow. I wanted to get a voltage reading from the fan plug but I accidently touched the two sensors on my volt meter and the computer immediately shut down. It started up and worked fine except the throttle was no longer working and the fans were running at full speed. This also explained why the second fan was running slowly before when they were both being throttled.
I guess in the end I got my wish to have my fans running at full power, I just wanted to see if there will be any future problems leaving it this way.
This question was solved.
View Solution.

Hello design_guy,
You should not have any problems with the fans running at full speed other than the fact you may decrease the life cycle of the fan.
You may want to install some software on the computer that will allow you to adjust the fan speed from the computer which may help you prolong the life of the fans and give you a little control over them.
Something like SpeedFan should do the trick.
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Fan running at full speed and all the time!

Hi,
I was wondering what could be the reason for my fan running on full speed at all times?
It is pretty annoying especially when I am in a quiet room. This just started happening this morning and I thought it was just going to stop but it didn't so I restarted my MacBook and shut it down also and still no luck.
Oh...
My battery meter only says 1:45 after I just took it off the charger when it said it was fully charged and I had the green light on my charger.
What could be the reasons for these two things?
Thanks,
Sam

I reset the PMU and the fan is still going at full blast right when the MacBook starts up.
Will I know that the PMU is reset or will it just fix the problem if it is?
Does anyone know a solution?
The computer is running fine but it's just the fan that is really loud and going at full speed and the battery life is extremely short for some reason.

Mac mini fan starts every 20 secs

After reviewing posts with similar issues, I tried:
- Rresetting PRAM
- Resetting the SMC
- Since I wanted to do a clean install for a while, I did a Snow Leopard clean install.
After all of this, the mac mini fan starts and inmediatley goes quiet. It repeats this over an over every 20 seconds.
What else can I try? My Mac mini is from 2007 (2 GHz, Intel Core Duo 2)

Since you've done a clean install (and updated to current/latest release?), and the AHT didn't find any obvious issues, and an SMC reset didn't help, let's look at more causal sources.
Have you looked at the vents on the bottom to ensure they are free of lint/dust/animal hair/etc? Plugged intake vents can cause high temperatures and the fan behavior you're hearing.
Have you looked at the Activity Monitor (on your hard drive in applications/utilities) to see is any program is using much of the processor, which would drive heat in the system?
Do you have iStat Pro so you can see what the temps are on various components?

MAC Mini: fan ran at full speed on power on - advice please

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