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

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Loud fan after resetting SMU

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I figured it was something easy. Thanks a bunch (my ears are still ringing)
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Fan Noise After SMC Reset

I apologize if this question has been covered in another post; however, I looked around for quite a while and didn't see anything.
I suddenly started having issues with my iSight today. I searched troubleshooting and was instructed to reset my SMC. Which I did. As soon as I powered my computer back on, though, the fan started blowing like crazy. It's far too loud for normal use! (My iSight works again.)
Can anyone help me return the fan noise to normal. Everyone else says to reset the SMC... but that's what caused my problem in the first place. Any help would be GREATLY appreciated!!

Be sure that after resetting your SMC you are not pressing the power button while plugging the power cord back in to your iMac. If you did, you need to reset your SMC again

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Hi folks
I been having issues with my G5, where it would freeze up unexpectedly and then the fans would come on full tilt.
I received some advice about resetting the SMU and the PRAM.
Now my mac dose not get past the grey screen. I have to hard drives attaches one has OS 10.4.11 the other has Leopard.
Odd thing about the Pram is I never got the mac to re-chime.
Also I was advised at the apple store to disconnect power for 30 sec and then hold the power button on for 20 sec after the restarting. I heard an odd tone and then the fans came on.
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As the unit will not run with the fans removed.
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There is a battery that makes the PRAM work. You may need to replace the battery.
You may also need to limit your RAM to two 1 GB modules, making sure they are made for the PowerMac G5 of your machine's age. Not all 533 MHz PC2-4200 DDR2 SDRAM. will work with the machine, it has to be specifically made by the age of the Mac model, and Mac model name according to the vendor. Thus if you have a Quad Core Mac from 2005, that's what you need to buy RAM for. Do not buy 533 Mhz PC2-4200 RAM just because it says it is that.
http://www.crucial.com/ and http://www.macsales.com/ specify the model and age of Mac in their store.
Others may too, but do not have ValueRAM or non-lifetime warranty RAM.
Lastly, your model may have liquid coolent that has run out or gotten old, making it not boot. If unsure where it is, ask an authorized service center. Some have leaks and won't boot at all.

This morning my PB G4 would not get to the password screen after power on. I have rebooted many times and very loud noises (like a HD spinning/rubbing) emits. Tried the Install disk and it cannot find the hard drive. Ran HW test and got a "Mass storage E

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I believe your hard drive has failed. Hope you have a backup.
Failing Hard Drive Sounds http://datacent.com/hard_drive_sounds.php
Listed by drive manufacturer. Click on the > next to the drive & you will hear the typical failure sound.
How to Tell When Your Hard Drive is Going to Fail
http://www.lifehack.org/articles/technology/how-to-tell-when-your-hard-drive-is- going-to-fail.html
Grinding And Clicking – Symptoms Of A Failing Hard Drive
http://pcperformancetools.com/getdata/grinding-and-clicking-symptoms-of-failing- hard-drive.html
Failing Hard Drives
http://losangelescomputerhelp.com/computer_networking_news/failing-hard-drives.h tml
 Cheers, Tom

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I have a similar problem. My son was using the computer at the time so I don't know if he saw the kernel panic. The screen is black and the computer won't boot. The fan runs loudly and doesn't stop. The battery is relatively new, about six months old. I've tried plugging in an external monitor but there's no signal.
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I've had my Macbook pro for about 3 1/2 years now. It has worked great until recently. A few months ago I noticed that the fan would always run really fast when I was doing simple tasks. After a few weeks/months, the fan was still really fast but it also started to make these loud noises. Now, it only occasionally makes the loud noise if I move my computer after its been stationary for a while. The fan no longer works at all and my computer gets exceptionally hot almost instantly when I turn it on. Is there a way to fix this problem without having to pay a ton of money to have someone fix it for me?

You can try a SMC reset:
http://support.apple.com/kb/HT3964
you can also check this:
http://www.ifixit.com/Answers/Active?search=replace+fans&csrf=sqmfo0yj19

IMAC freezing, hang during startup, loud noise coming out from the speaker

I am using the iMAC i3 Intel based which i bought it just a month ago
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I've experienced similar symptoms to the original poster's description. I have an iMac 27" 2010 model. This may be related to the following:
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Loud fan after logic board replaced

I just had the logic board replaced on my 17" iMac after it would not power up (apple did it for free because they said it was one of the defective boards). The fan now is VERY loud. I have tried reseting the SMU, setting the CPU speed to something other than automatic. Nothing seems to work. Top say the machine is idle 95% of the time... Before the board was replaced it was VERY quiet... Any ideas?

fxmBoston-
Greetings and welcome to the Apple boards.
Miriam is right. Take it back and have it repaired correctly. We have good consumer laws in MA so they have three chances to get it repaired correctly or they owe you a refund or a new machine.
Be firm yet polite.
Luck-
-DaddyPaycheck

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

Loud noise when printing

print quality good but loud noise when printing. do printers need "oiling"?

Hello @mikeed,
Welcome to the HP forums.
I understand that your 7500A is being rather noisy.
I would like to help.
Unfortunately, there is not way to 'grease up' the printers gears.
If the noise goes away when the product is on, and disconnected from the computer, there might be a connectivity problem. Use the following steps to isolate a connectivity issue with the computer.
Shut down the computer.
Turn off the product.
Disconnect the USB cable from the product.
Wait 30 seconds.
Turn on the product.
Print a self test report
Turn off the product.
Connect the product to a USB port on the computer.
Turn on the computer.
After the computer finishes booting up, turn on the product.
If you still hear the sound, connect the product to a different USB port on the computer. Check the functionality of the product.
If you still hear the sound, connect the product to a new computer.
Check the functionality of the product.
If the sound continues and the product functions normally, the sound is a normal sound.
When the product prints, the rollers, gears, paper feed, and carriage makes noise.
When you print in the Fast or Draft modes, the product makes more noise than when you print in the Best or Normal modes.
Check the following:
If the product did not print successfully, check for a paper jam.
Check that the product supports the paper you loaded.
Make sure the paper is loaded correctly, the trays are extended, and the paper guides are adjusted properly.
You can also try the following.
Remove and reinsert the cartridges to make sure that they are correctly installed in the unit.
Perform a hard reset.
While teh printer is powered on, unplug the printers power cord.
Wait at least 30 seconds.
Plug the power cord back into the printer.
Aardvark1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!

Hard Drive is making a loud noise on my laptop! Help!

Hello,
I have owned my hp envy 17 laptop for almost 2 years now. Recently my computer has been making a really loud noise and it seems it is working a lot harder than it needs to be. I suspect the fan or the hard drive is the culprit but I have convinced myself it is the hard drive.
When I start up my computer the loud noise begins almost immediately after startup. This noise sounds like the computer is working as hard as it possibly can, almost making a grinding noise. Even after the computer has booted up, this noise continues for another minute or two before it stops, then my laptop becomes quiet. What puzzles me, and leads me to believe it is the hard drive, is the fact my computer get unreasonably hot when the noise occurs; it never used to do this before.
This is not what confuses and annoys me the most, it is the sound reoccurring again. This situation is something I have never heard of before. My laptop for some reason ,when it is moved or bumped, even the slightest, start to "rev" and the hard drive roars; it does this for five minutes or so. It also does this when the laptop is closed, and in "sleep mode"; the slightest bump lets it off like a baby. I suspect that there is a switch, flap or wire that is not attached properly and when moved it triggers the hard drive.
I have found a few small solutions to this problem. The main thing I do when the sound occurs is I close the laptop lid which puts it in sleep mode and turns off the hard drive, silencing it for the time being. This solution I came across by accident; I turned my laptop sideways when the sound occurs and the sound stops until I put the laptop upright again(Laptop is open).
I would like to hear your thoughts on this, a solution you might of have encountered or any explanation of the cause; also explain any costs. I have partially opened up my laptop and it looks in order to me with the dust at a minimum. I'd rather check online for a solution first before bringing it to a computer repair shop which, i'm willing to do as a last resort.
Sincerely,
Greg
This question was solved.
View Solution.

Without hearing the sound it is hard to judge but it does not sound like a hard drive from your description. Hard drive noise is usually a rhythmic "click" not a sustained "whirr". That kind of noise comes from a cooling fan. We can test the hard drive in the BIOS. Tap F2 as you power up to enter UEFI diagnostics and look for the hard drive test. If you do not have UEFI diagnostics (i.e. your laptop came with Windows 7 not Windows 8) then tap F10 and look for a hard drive diagnostic in the old-school BIOS interface.
The Envy 17 series tends to run hot and cooling fan issues are not uncommon. Sometimes it can be fixed by self-help such as blowing out the fan with compressed air. If it is the fan, the replacement fan is not too expensive but labor might run $80-150 for replacing the fan. Post back with any questions.
If you are going to post back please give us your full model number found on the bottom of the laptop or in the battery bay.

10.4.10 vers 1.1 | Loud noise and Hum on speakers thru' USB Audio Interface

After doing this update all of a sudden my Mbox2 produces loud noise and Hum on my attached speaker when hooking up the power adapter to my MbookPro or adding a second display... I can virtually hear when the computer is computing thru' the speakers... This noise thing adds up the more equipment I hook up...
Does anyone know what this could be....???

This can happen if the software is "allowing"
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This isn't quite accurate. USB devices can ask for power, up to 2.5 watts (500 ma @ 5 volts), from a USB port. Software can query the device for its power requirements & shut down the power to it (& warn you it is doing so) if it exceeds that limit. However, the hardware in Macs themselves (& essentially all other computers) also have a number of power limiting circuits, independent of the OS software, that make it just about impossible for the software to "allow" more power than this to be drawn from the port. (If they didn't, they would not meet most of the world's safety codes.)
Moreover, if your USB speakers (or any other USB device) requires more than 2.5 watts, it would never have been bus powered under any version of the OS, assuming it meets USB standards (IOW, displays an official USB logo & is not itself defective).
If the technician is telling you something different, it might be a good idea to find a more qualified one, or at least get a second opinion.

Loud Noises after reset of SMU

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