I reset the smu, cooling fan stays on continuously,

Is the cooling fan supposed to stay on all the time? I've had my IMac since late 2009 and the fan never came on until I reset the SMU yesterday, now it stays on. I looked at the activity monitor and all is quiet. Should I reset the SMU again? Thanks for your time.

Reset the SMC again.
http://support.apple.com/kb/HT3964

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I just reset the SMU on an ISIGHT G5 and a beep was emitted

I followed the instructions here
http://docs.info.apple.com/article.html?artnum=301733
Is that normal to get a "tone" or a beep while holding down the power button in the process of resetting the SMU?
I'm only asking, becasue I thought that a single beep was a RAM Issue, and no where does it say on the Apple document for SMU resetting, that there supposed to be a BEEP.
Anyone?

hey...how goes it?
I reset the SMU becasue I was tiold it might help with some noise issues. I don't necessary have any blaring fan issues, but I thought it wouldn't hurt to reset it for other noise that I am having with my imac.
Anyway, it didn't. But, the tone or beep I was describing was a solid "BLOOP" or "BOOOP." Very abrupt and forceful, to say the least. If that helps to describe the sound. It was nothing like the usual start up sound.
Anyhoo...
I think I'll take it in soon for a check up.
thanks again

Resetting the SMU

Greetings,
I wanted to reset the SMU. I followed the instructions on this page:
http://docs.info.apple.com/article.html?artnum=301733
But I didn't know when to go to the fifth step! As I hold the power button the computer gave a peep. Then the white light in the front kept flashing. Finally the computer gave me a screen saying this:
Apple PowerMac 12, 1 5.2.6f1 bootROM built on 10/05/05 at 18:02:54
Copyright 1994-2005
Apple Computer, Inc.
All rights reserved
Welcome to open firmware, the system time and date is: 09/02/2007 00:43:20
To continue booting, type "mac-boot" and press return.
To shut down, type "shut-down" and press return.
Reducing system power.......
ok
0 >_
I let go the power button. And the keyboard didn't respond to type anything (I plugged back the mouse and keyboard). I waited more than five minutes, while the fans ran too fast. I pushed the power button and shut down the computer.
What went wrong?
Thanks,
Master96

You booted into Open Firmware by mistake:
Open Firmware, X.XX
To continue booting the Mac OS type:
BYE<return>
To continue booting from the default boot device type:
BOOT<return>
ok
0)
+* What is this screen?+
+* How did I get to this screen?+
+* How can I get back to the regular Mac OS?+
+This screen is the Open Firmware screen. Beginning with Power Macintosh computers equipped with PCI slots, Apple has used a firmware operating system called Open Firmware for controlling hardware.+
+Open Firmware is a cross-platform firmware standard for controlling hardware and is used by all PCI-based Mac OS computers. Open Firmware is used mainly by Apple hardware developers and rarely is there a need to start up into Open Firmware.+
+While it is difficult to start up into Open Firmware, it does happen if you hold down the Option-Command-O-F keys when the computer starts up after having been shut down. The PowerBook should never start up into Open Firmware on its own.+
+If you are at the Open Firmware screen and want to go back into Mac OS, type "BYE" without the quotes at the command prompt, then press the Return key. This exits Open Firmware and continues starting up into Mac OS.+
I assume the computer is working now, but why it went into open firmware I don't know.Probably, you held the start button down too long. In any case, you have probably reset the SMU and hopefully fixed your problem,

Resetting the SMU. Silly machine.

I have a problem on startup, where by the power light comes on, but sticks with a black screen and no startup noise.
After following the troubleshooting guides on the site, I attempted to reset my SMU to see if that would help.
With the back panel off, LED1 came on, followed by LED2 once I pushed the button which of the two is nearest the top of the screen. Now - when pushing the other button (to reset the SMU), the guide said it should reset the computer. However, the button merely powered the computer down...I have no idea if the SMU reset actually happened or not. Is there any way to tell? Powering up the iMac again results in the same problem.
I'm out of warranty and don't have AppleCare. The service provider in my town charges £45 just to see the machine, then £90 an hour labour + parts if any are required. I'm a student! Need to try everything I can before resorting to forking out for the repair. Got food to buy and stuff...
Anyone got any suggestions? Please..?!

As you have one of the "first generation" iMac G5's you are a candidate for the free "repair extension program", Adam. It sounds like a classic case of this problem - see http://www.apple.com/uk/support/imac/repairextensionprogram/ and check your serial number.
Cheers
Rod

Resetting the SMU on a Power Mac G5 (Late 2005)

Guys,
I was just reading the "How to reset the SMU on a Power Mac G5 (Late 2004/2005)" page http://docs.info.apple.com/article.html?artnum=300341 and am now a little confused.
I own a Power Mac G5 (Late 2005), and every night before bed I turn it off and take the power plug out of the wall. In the instructions to resetting the SMU on a Power Mac G5, it states to remove the power cord from the computer for 15 seconds and then plug it back in.
By me always taking the power away from the computer, is this resetting the SMU every time? If so, can this cause problems?
Regards,
Daniel
Dual-core 2GHz PowerPC G5 Mac OS X (10.4.6) 1GB 533 DDR2 SDRAM

Presuming that you are referring to the 'relay click' sound when the G5 is first connected to mains power -
I have not seen an Apple Official mention of this initial relay sound, let alone an explanation of what the initial relay does; but, over the course of two years in the G5 Usage forum, the absence of it is invariably bad news for the Power Supply Unit(PSU)(or other major bits). So - yes, it is supposed to happen.
If you have no economic or environmental objections, and you can arrange for the G5 to remain plugged-in and the mains turned on, that should alleviate premature internal battery drain.
Personally... I leave it plugged-in because the G5 is on a UPS, and also it would mean foraging in the jungle of wiring under the desk...
BTW If you don't already - as the G5 is not on 24/7 the OS X maintenance scripts will not run; you may wish to consider running 'sudo periodic' from Utilities - Terminal occasionally - as explained in the thoughts of Dr. Smoke here
http://www.thexlab.com/faqs/maintscripts.html
Trust this helps.

Resetting the SMU on first gen iMac

Okay so I've been having some apparent overheating problems with my iMac G5 and in a previous post I was told to reset the SMU. Since I have a first gen iMac I know that there is a button to push somewhere inside my comp. Does anyone know where it is? All I can find directions for are the newer iMac models.
~Hailey

Hi again Hailey,
I hope this works for you:
http://docs.info.apple.com/article.html?artnum=300908
I suggest reading it several times..
Rick
iMac G5 iSight 20" - 30G iPOD in Slimming Black - Mac OS X (10.4.7) - HP Pav 15" WS and Toshiba Sat 17" WS LP's - Canon 20D & A620

Should I expect a lot of noice from the internal cooler (fan)? Thx

I hear a strong noice from the cooler when the equipment has a high temperature... (like an airplaine enginee)
Can aomeone tell me if it´s a normal behavior?
Thanks much.
Leandro

ABSOLUTELY normal. It will be louder when the computer gets hot, thats what it is supposed to do. The fan kicks into higher gear to keep the processor cool and remove the excess heat from the case. I only ever notice my fan when I watch videos for a long period of time. I never hear it any other time.

The internal cooling fan(s) on my MacBookPro have quit running. Possible reasons why?

the cooling fan(s) on my MacBookPro have quit running. Looking for answers to this problem

Now that I think about it, I wouldn't even try inserting a disc or even using it. Without fans you could very well fry things on your mac (as Allan Eckert said) that might end up costing you more. Turn your mac off and don't use it again until it gets looked at.

I have a Mac Pro 1 - ser #YM******UQ2. The cooling fans stay on constantly - any solutions?? Many Thanks.

Any idea why the fans are not shutting down? The shut down when the computer goes to sleep but come back on when the computer comes back on.
<Edited by Host>

First try an SMC reset.http://support.apple.com/kb/HT3964
http://support.apple.com/kb/HT3964
Second, look to see if you have a runaway application;
http://support.apple.com/kb/TS1473
Third, bring it to an Apple store genius bar for resolution.
Ciao.

What is the best cooling fan system for Macbook?

There are a lot of cooling pads and fans out there, and I wanted to know if there is one in particular that is most effective.

Quote from: GMBazillion on 04-August-05, 02:46:04
Well I checked at PC Progress and I found a Thermaltake Volocano 10+ and a Thermaltake Volcano 12+ for reasonable prices.
Are these good CPU/Heatsinks and if they are...
Would it be better for me to go with the 12+ instead of the 10+ because it's a higher number? What is the difference between those two models?
http://pcprogress.com/product.asp?orderid=106056635439849489927291&PID=FANVOLCANO10%2B
http://pcprogress.com/product.asp?orderid=106056635439849489927291&PID=FANVOLCANO12

Powermac G5 quad - where ist the SMU-Reset Button?

my G5 quad is very fast, but too loud. The Main Logic Board Backside Fan increases speed after maximal 5 Minutes up to 3000 rpm, even if the quad really does nothing. I tried to reset the SMU by removing the power cord, but no difference.
An Apple instructor sent me this:
"To reset the SMU on a Power Mac G5 (Late 2005) computer, either use the steps listed above for the Power Mac G5 (Late 2004) or:
Turn off the computer by selecting Shut Down from the Apple menu or by holding the power button until the computer turns off.
Open and remove both the metallic outer door and the inner plastic air deflector.
Remove the fan assembly immediately to the left of the processor module.
Press the SMU reset button on the logic board.
Replace the fan assembly, air deflector, and outer door.
Turn on the computer."
…but I can't find the SMU reset button. Can anybody help me?
Powermac G5 quad Mac OS X (10.4.3) 2,5 GB RAM

Hello
Choose "turn off" in the Apple menu, unplug the power cord, open the side door, unplug the lower fan, put your hands on the Quad Tower Case before you touch the SMU Button, then push the button only one time.
Here is a Picture from a Dual-Core 2.0, should be on the same place:
http://img470.imageshack.us/img470/7594/quadsmubutton8gq.png
Apples Knowledgebase Article says it works also like for older Late 2004 G5's. A little confusing for me.
http://docs.info.apple.com/article.html?artnum=300341
Power Mac G5 2.0 Dual-Core | Firmware 5.2.7f1 | 512MB Ram | Mac OS X (10.4.3) | GeForce 6600 LE PCIe 128 MB | Pioneer DVR-110D

Loud Noises after reset of SMU

I just hooked up my iMac today and the built in iSight went black on me. After reading a little bit on these forums, I reset the SMU by shutting down, removing power plug, waiting 10 seconds, plug power cord back in while holding power button, then starting back up. The iSight works fine now, but there is loud noise which appears to be the fans or maybe hd or processor? It is on while starting up and still is on at this moment. It was not nearly this loud before I reset the SMU. I tried restarting, shutting down and turning back on and its still loud. Whats could be causing my problem and how would i fix it? Thanks

The Intel iMacs do not have an SMU, those instructions are for the iMac G5s. The Intels have an SMC. Here are the instructions.
How to reset the System Management Controller

A1212 Macbook Pro Cooling Fan Speed / SMC / Service Battery

Background:
I've owned my A1212 Macbook Pro Core 2 Duo since launch (Thanksgiving 2006 I believe). For some time now the temperature has been quite warm - more recently my right cooling fan has intermittently sounded like a jet engine and failed to speed beyond 1,500-2,000 rpm intermittently.
1. I ordered the correct cooling fan for A1212 right and replaced.
2. When I rebooted Macbook Pro here is what I see for temps in hardware monitor
AMBIENT TEMP 31C/88F
CPU A 44C 111F
CPU CORE 1:36C/97F
CPU CORE 2:39C/100F
"SMART DISK" — [DOES THIS MEAN THERE IS A SENSOR THAT IS NOT REGISTERING]
The hottest temp recorded is 109F/ CPU A temperature diode
The new cooling fan is majorly cooling the mac much better than prior fan.
3. I can't find ANY way to stop the mac from running both cooling fans at 6,000rpm
a) reset SMC (tried holding down power button 20 seconds after disconnecting battery
b) reboot
c) remove smcfancontrol
d) use smcfancontrol
e) monitor with temp monitor, hardware monitor, istat pro
f) no runaway processes - not even hot
4) I notice ( this was also showing up before install of new fan) in my battery icon it indicates "Service Battery" - while I do have a 4 yr old computer there was a recall on batteries so this battery is maybe 3 yrs old and I usually use computer plugged in.
I do not have my snow leopard boot dvd readily available to run hardware test on sensors, however techtool pro does not report any issues. I have not found any terminal commands to force the fan speed down nor any indication I have any apps that are accelerating it.
It appears that my fan speeds are accelerating shortly after power up - before OS X is even loaded completely - and never slow to normal speed except when mac is asleep.
IS IT POSSIBLE TO CONNECT THE FAN INVERTED (THE TWO PINS) MESSING UP ABILITY TO CONTROL FAN SPEED?
IS IT POSSIBLE THAT I INADVERTENTLY BROKE SOME SENSOR "SMART"?
I am thinking more and more that this is hardware related like a sensor. Any assistance would be greatly appreciated, while I don't have a Jet engine I have a very noisy mac

Hi N,
SMART reports on a number of checks on the HD. I don't believe that's any part of the current issue.
I agree with you that my first inclination is toward a sensor issue; by default, if the sensor's are not reporting properly, the fans run full speed/6000RMP.

RADEON 9800 cooling fan

I have a RADEON 9800 Pro Mac Edition 256MB in my QuickSilver 2002 mounted in the AGP slot. The 9800 cooling fan is very loud (grinding sound) after a cold startup then gets quiet after it warms up. I have looked at third party cooling fans for this RADEON and I have found the Zalman v700cu and the Arctic Cooling ATI Silencer 1, Rev. 2 that seem to be compatible. From the images of these two coolers it looks like the two mounting screws that project out the back of the garphic card are very close to the lower memory slot in my QuickSilver. I don't use the PCI slot next to the AGP slot so I know the coolers will be OK there.
My question is, has anyone actually tried one of these coolers in a QuickSilver 2002 and is there enough clearance between the mounting posts on the cooler and the memory card to prevent them from touching?

ATI fans are notoriously bad (read that as cheap). You will know the fan is going bad when you hear a loud whine or grinding noise after a cold startup or during heavy use. The fan went bad on my 9800 Pro 256 after just 5 months. I had to send the card to ATI for repair - nearly 3 weeks to get the card back. The replacement ATI fan started making noise after another 90 days. I can't see doing this on a regular schedule for the three year warranty term so I replaced the stock fan with an Arctic Cooling ATI Silencer 1, Rev. 2. It's easy to install. So quiet that I can't hear it run and my computer case and power supply fans run slower and with less noise than ever before due to the Arctic fan venting warm air out of the computer.
The Arctic Cooling ATI Silencer 1, Rev. 2 installed perfectly with no modifications and minimal effort. It has a 6 year warranty. I consider this modification the best thing you can do to protect the $250 (or whatever you pay) investment you make with the RADEON card. It's better than waiting for the stock fan to fail and cause your 9800 to melt down. Technically installing the Arctic fan voids the ATI warranty but I believe I could reinstall the old stock fan if the card needs other warranty repairs without anyone noticing the switch was ever made.
So your answers are yes and yes although I never had the monitor problem you describe. The ATI card is a good choice - keep it then download and install the latest drivers from the ATI/AMD web site and do yourself a favor and buy an Arctic Cooling ATI Silencer model for your card. Install it when you start to hear the stock fan going bad. You will be glad you did.
PS - many thanks to FangSuede for his excellent advice given to me.

HP Notebook 2000 cooling fan issue

Hey, everyone. I've had my HP Notebook 2000 for a few years and I've discovered my first major issue just a few days ago when the cooling fan stopped working. I don't really mind it too much because I have a USB-powered cooling fan that my laptop rests on, and it does a pretty good job. My entire laptop remains at about the same average tempurature.
The biggest issue I'm having is every few hours, the laptop will automatically shut off because of it.
As well, when I boot it up (turn it on), it gives me a reminder that the cooling fan isn't working and I will have to press "enter" or the laptop shuts off in 15 seconds.
How can I make it so the laptop ignores the broken cooling fan? I don't want to spend the money to repair it because I can rely on the USB-powered cooling device.
Thank you!
~Mark
This question was solved.
View Solution.

No you can't. Reason it probably shuts down is because cpu temps peak over safety threshhold at times thus it shuts down to prevent damage.
Cooling systems on hp's are not the best when working so thermal stress on cpu,gpu & mainboard will be bad & failure failure will occur quite quickly.
Fan assembly is very cheap & can be done DIY if you have some skill in dismantling these sort of things & following hp service manual & other online guides.
I expect a new fan & new thermal paste & shimming along with cleaning would do wonders for running temps & long term health of the notebook.
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I reset the smu, cooling fan stays on continuously,

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