After Restart fans operate at full speed with no picture

Yesterday I used my mac all day, no problems. Last night I decided to do a restart in order to freshen the memory. I had quit all applications.
THis morning I powered it up and the imac came on but the white light in the lower right corner of the mac lit up and stayed on. The fans sound like they are running full speed. No pic on the mac but it obviously has power and powers up.
Any ideas on what happened and how to fix this outside of taking it in for service? Thank you.

So I made my ProCare appointment online for this afternoon. I showed up on time and there was a Apple tech AT THE FRONT OF THE STORE that greeted me, took my iMac and asked me to follow him to the back of the store to get written up for service. After 10 minutes they took the mac to service and determined that the problem is:
MLB Failure
Issue: Boots to no video; fan spins up
Proposed Solution: Replace MLB (a logic board)
So they need to replace item number 661-3597 Logic Board and it is considered Hardware Repair Level 2.
I just received a call at 8:55 p.m. tonight from an Apple store representative saying my imac is done, install went good and I can pick it up anytime tomorrow.
Wow! What awesome service. ProCare is every bit worth it. Thank you to all the helpful people at the Apple Store at Woodfield Mall in Schaumburg, IL. This is the second time I have taken it in for service (unfortunately) and both times they have went above and beyond to service my machine (because I'm an ProCare member).
Oh. Yeah...and they serviced it at no charge.

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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!

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?
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I reset the PMU and the fan is still going at full blast right when the MacBook starts up.
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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.

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?
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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.
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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.

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)

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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!
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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.
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This question was solved.
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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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I have a 2009 21 iMac, recently the computer became very noisy with the fans running at full speed all the time even when checking the email or just using Safari. I don't do anything crazy like 3d renderings so I don't know why the fans wont stop. I recently cleaned it but this didn't seem to solve the problem.
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Hello irisfailsafe
Welcome to Apple Discussions
Reset the SMC > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
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deltatux
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< Edited By Host >

Fan running at full speed after shut down.

My brand new, three day old 8 core Mac Pro has already frozen three times. I have been reading about the screen garbage and then the freeze. That is happening with me, too. But what is going on right now as I type on my old G4 is that the fan on the new Mac Pro is running full speed and the computer has been shut down! The fan has been blowing like this for at least 30 minutes. I am hesitant to unplug. But I can't just leave the office with it blowing like that. What is going on?

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Message was edited by: midiotlv
Message was edited by: midiotlv

After Restart fans operate at full speed with no picture

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