Fan is loud and computer very hot.

The fan has been running pretty loud last 3-4 days and computer is almost red hot within seconds of coming on. Hardware test revelas error (code 4SNS/1/40000001:1DSR-0.000. Any thoughts or ideas or better yet, solutions? All help is appreciated. Thanks!
Len

Code "SNS" is a sensor failure. When a sensor fails, a fail-safe procedure kicks in and runs the fans full speed so the loss of the sensor will not lead to loss of the computer.
The only thing that might help is reseting the System Management Controller. See this Apple arilce for instructions:
Intel-based Macs: Resetting the System Management Controller (SMC)
Find the section that includes iMacs.
IF that doesn't help, you can't fix it at home. You will need to have Apple service the computer.

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I bought a ibook G4 2005 refur-ed it is making a fan running noise when I listen to sample music on line and it will not stop until I reboot.. What could that be also bottom of computer very hot?

I bought a ibook G4 2005 refur-ed it is making a fan running noise when I listen to sample music on line and it will not stop until I reboot.. What could that be also bottom of computer very hot?

When my iBook got hot like that, I would take a break and let it cool down.
You can buy laptop desks that have USB powered fans on them, such as the Targus Chill Mat.

My fan makes loud and very strange noises.

Hi again,
My fan makes loud and very strange noises. Is there any cure for that?
Thank you!
Markus

Hmm... that is strange. There are a couple reasons that I can think of.
First, go to System Preferences -> Energy Saver -> Processor Performance. See what its set to. If it is currently set to Highest, your fan could be going more often. Turn it down to Reduced or Automatic. Note if there is any difference.
Secondly, are you all up to date on software updates? The last step was to see if it was a software issue. If it isn't, then you probably have a defective fan. AppleCare?
Now, you would open your PowerBook. Look in the Apple docs (Support - Manuals) to find how to do it for yourself, or take it to a shop or Apple Store and have them do it. Safest option.
Look at your fan. Has it come free of the anchor and is hitting against the wall or fan surround?
Lastly, try keeping the PowerBook in a open, ventilated area. The fan will power up less if the computer stays cooler. For a possibly irritating but possibly helpful option, purchase a product that lifts the PowerBook off your lap or desk. I think Rain Design makes a good one.
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MacBook not going to sleep and getting very hot

I just purchased a MacBook and have been using it for a few days. I have noticed that it does not appear to go to sleep correctly and gets very hot in the process. I finished working on my MB about 45 minutes ago. At the time it was connected to the mains and I disconnected to catch my next train. I shut the lid and after a few minutes the sleep indicator light at the front dimmed once then stayed on permanently. I could not hear the drive spinning (though the drive is quiet on this machine and there was a lot of background noise) and assumed all was OK. Anyhow, I have just taken the MB out of its case some 45 minutes later and it felt extremely hot (almost too hot to touch, I would guess around 50ºC). The sleep indicator light on the front was solid white. I opened the lid and the machine woke up. Something not right here....Also power remaining was down to 72% so something has been using up a lot of energy and heating up the aluminium!
Tony
ps. Whilst writing this email the MB has cooled down considerably but still warm.
ps2. Probably not related, but I have firmware password protection enabled
null

I did see some of the other posts, but nothing about the MB getting so hot.
I tried sleep from the menu and this seems to work (though I have rebooted the machine since the above report).
What worries me is the potential fire risk/damage to the MB, the case was extremely hot.
Tony

On my older I-MAC (2005) the computer turns on, but all I see is a grey screen with a small file that has a question mark and smiling FINDER face on it. Then the fan comes on and becomes very loud. Please help...

My older I-MAC gives me a grey screen and flashes a question mark and smiling FINDER face inside a FILE icon. Then the fan begins to run and becomes very loud...and thats as far as it will let me go.

See KB Articles: http://docs.info.apple.com/article.html?artnum=106805 Mac OS X: "Broken folder" icon, prohibitory sign, or kernel panic when computer starts
http://docs.info.apple.com/article.html?artnum=31355 Mac OS: Flashing Globe When Computer Turns On or A folder that has an alternating flashing question mark
http://docs.info.apple.com/article.html?artnum=301733 iMac G5: How to Reset the SMU (iMac G5, the iMac G5 (Ambient Light Sensor), and the iMac G5 (iSight)).

Will running games that make the fan run loudly and the computer heat up damage my machine?

On my Macbook Air running Yosemite 10.10.3, with 4 GB RAM, 251 GB storage (170 GB free), a 1.6 GHz Intel Core i5 processor, and Intel HD 6000 1536 MB graphics card, when I play games such as Batman Arkham City, I experience very smooth gameplay with high fps. The only thing that worries me is when I play, the laptop heats up very much and the fan runs pretty loudly. Even with old, less intensive games like GTA SA, the computer gets pretty hot and the fan runs loudly. Is this damaging the computer, or can I continue to play these games?
Thanks.

Yes you can continue to play games but heat is the bane of electronics and in time there will be a cost. When is hard to say, but I can put it this way, a fan running constantly at high speed is more likely to fail sooner than one at a slower speed.
Ciao.

15" MacBook Pro runs hot, fan is loud, and incredibly low battery life

My 15" MBP was bought in March or April (can't remember) from Singapore Apple Store. Here are the stats:
MacBook Pro 15-Inch, Late 2011
Memory 8 GB 12222 MHz DDR3
Software Mac OS X Lion 10.7.5 (11G63)
Also I'm using about 1/2 of the available 750 GB of storage.
Here's what's up:
1. The fans boot immediately after the computer is turned on and never stop, making everything much too loud...like a plane is taking off or something.
2. The computer is WAY too hot. Right now I'm running Astrill, Chrome, Activity Monitor, and System Utility, and when I put my hands on the thing it feels like my fingers are going to melt.
3. The battery life, even at a full charge, is about an hour overall, which ***** for so, so many reasons.
Here's what I've tried:
1. I took it to the Shanghai Genius Bar, but I think that the language barrier is impeding my ability to really say what's wrong. I backed up, and they wiped the hard drive, re-loaded the OS and put all my old stuff back on the computer. They also deleted SOMETHING from the Preferences part of the library, but I don't know what it was. Everything runs much faster now, but the fan, the heat, and the battery are still having their issues.
2. I've checked the "all processes" CPU usage. There's nothing unusual (as far as I can tell), so I'm at a serious loss as to say why the computer is running so hard. Even with all the processing running as you see below, the fan's still blasting and I've lost 50% battery life in the past 40 minutes.
3. I've tried the fix that requires deleting com.apple.desktop.plist and com.apple.desktop.plist.lockfile. It changed the way the desktop looked and absolutely nothing else.
PLEASE, PLEASE, PLEASE help me! I'm a graphic designer and often run the CS6 Suite. (Currently, however, I am NOT running any Adobe programs and I'm still experiencing the problems.) It's really important that I am able to run Photoshop, Illustrator, and InDesign at once, and it CAN, but with the heat problems I'm having without ANY of the graphics stuff running, it worries me.

Just took another look at iStat Menus (I've only had it for a couple of days - I used to use the old iStat Pro widget) and it seems as if you can make fan speed defaults and use them instead of relying on your MBPs sensors to take care of the fans... see...
Might want to use that 'medium' speed (there by default as I know I didn't add it) and keep an eye on your temps. If you start heating up to much, go back to the 'Default'.
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Why are my fans so loud and my macbook pro so hot?

I have a 15" MacBook Pro. I've had it since a little bit before Christmas and the fan has always been so loud and the laptop itself, as well as the charger, tend to get VERY hot VERY quickly. I'm keeping it elevated so it's not being suffocated but it doesn't seem to help. I've already checked Activity Monitor and nothing is running up my CPU very much and I'm out of options. Any help is appreciated!! It's driving me crazy!!

Those are very, very high temperatures and very high fan speeds just trying to cool things down.
Now - which applications or processes are turning up the heat? Open Activity Monitor (Applications>Utilities) and select "All Processes" and sort by CPU %:
Then post your screenshot (http://support.apple.com/kb/PH4391) using the little camera icon in the composition bar at the top of your reply.
Clinton

My fan goes on and is very loud, why?

Hi,
The fan goes on sometimes on y IMac and it is very loud and won' tstop.
Could you tell me what is the problem?
Tx,
Mimi

If the fans are very loud and won't stop, you need to find out what's causing that. Open the Activity Monitor
 > Applications > Utilities > Activity Monitor.app
Select 'All Processes' from the drop-down menu on the right.
Click the %CPU tab in the window, twice if necessary, so that the little arrow is pointng downwards.
What's at the top, and how much %CPU is it using? That's what's causing your fans to run fast.
If you're burning or rendering a video or doing a lengthy download, it'll stop when your process stops. If you're not doing anything but some process is using up 80% or more of your CPU, select it and hit 'Quit' from the taskbar. You may have to choose 'force quit' and add your password if requested depending on what the process is.
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Try resetting your SMC and PRAM.
Resetting the System Management Controller >>
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My new 20" ICD iMac was quiet for a month till it started doing the full blast fan routine. I also zapped the PRAM and reset the SMU with no luck at all. I then came across this article which I thought was irrelevent to the situation: http://docs.info.apple.com/article.html?artnum=300351
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Anyone else seeing or heard of this type of behavior???

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After browsing websites, the fans get louder and louder, no internet.

Hi,
With my 2011 Macbook Pro 15inch, I have found that browsing some websites causes the fans to spin up very loud and the internet to drop.
Websites won't load etc. Even after reconnecting to my wireless network. The only thing that seems to fix it is rebooting.
Sometimes this will happen quickly, other times it may take an hour of browsing before the internet stops working and the tell-tale sign of the loud fans
makes an appearance.
All other features of the laptop work, just not the internet. Across all browsers too.
Thanks in advance,
Finn

The only way to know what is going on is to retrieve the certificate and check who is the issuer.<br />
It is always possible that the server doesn't send the full certificate chain (intermediate certificates), so it might help to post a link to this website
Check the date and time in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
Check out why the site is untrusted and click "Technical Details to expand this section.<br>If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) then see if you can install this intermediate certificate from another source.
You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.
*Click the link at the bottom of the error page: "I Understand the Risks"
Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".
*Click the "View..." button and inspect the certificate and check who is the issuer of the certificate.
You can see more Details like intermediate certificates that are used in the Details pane.
If "I Understand the Risks" is missing then this page may be opened in an (i)frame and in that case try the right-click context menu and use "This Frame: Open Frame in New Tab".
*Note that some firewalls monitor (secure) connections and that programs like Sendori or FiddlerRoot can intercept connections and send their own certificate instead of the website's certificate.
*Note that it is not recommended to add a permanent exception in cases like this, so only use it to inspect the certificate.

My macbook pro's fan is loud and airport stops working and other problems

So i have a macbook pro 13" i got it September of 2010 and since november 2011 ive been having major problems.
My macbook's fan gets extremely loud and the computer heats up and also the internet just stops working. Sometimes the computer will run very slow and sometimes it just freezes up. Im tired of this and need some help please

I did screenshots of my Activity Monitor so you can see for yourself and try to make sense of it.. cause i can't
http://i25.tinypic.com/a337o2.png
http://i31.tinypic.com/bgojma.png
http://i26.tinypic.com/ra9nwm.png
http://i25.tinypic.com/slpd3r.png
http://i28.tinypic.com/28vvqc5.png
---what is VSIZE?
updated - I think this might be the problem! Maybe its cause when there is flash banner ads playing on websites in the background it raises the level of "memory usage"? have a look
http://i27.tinypic.com/etcsqb.png
-Joey

NEW HARD DRIVE - FANS RUNNING LOUD AND RED LIGHT

I've just installed another hard drive in the lower bay of my G5 1.8. I took one drive out and inserted the new one, leaving the original hard disk with the operating system on where it was.
As soon as I pressed the "on" button the machine powered up but with the fans on very loud and a red light on inside the machine.
The G5 starts up fine. The new hard drive is recognised.
Any ideas what's gone wrong as it wasn't behaving like this before?
Thanks in anticipation

Hi gravenors, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
You could try checking that the clear plastic air deflector has been replaced correctly.
If it seems to be in place, but the fan and red LED are still on, please post again - as there are further things to try.

Fan is loud and computer very hot.

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