IMac 2.4GHz - No startup sound, no fans spinning

Hi !
I have a iMac 2.4 GHz with 4 GB RAM and running MacOs 10.5.8
A few weeks ago it suddenly went dead. When I try to startup again, no startup sound appears and no video (black). Suddenly again it startup with sound and video and worked about 30 sec then went dead again (?). I have worked earlier as technician so I opened the iMac and I saw that only 3 of 4 leds lit when I try to start it up. The 4:th led tells me: "LED 4 lights only if the computer detects an over-temperature condition. This LED will be OFF when the computer is turned on and running at the correct temperature".
Can someone help me with this. Anybody experienced the same problem ? Have tried to disconnect the internal HDD and tried change RAM.
Regards
Magnus

I have the same imac and have the same problem. I was playing a light-on-processor-usage windowed game, and suddenly the screen went black and the sounds stopped. I pressed keys and heard no activity in response from the computer, although it still was "on" as far as it had power to it, and i could hear the slight harddrive noise (still spinning, not read/write sounds). So i held the power button down to shut it off, then i pressed the power button to start back up, and no familiar startup tone, no video(screen stayed black, didn't even flicker). So i let the computer sit unplugged all night, then tried it in the morning. still same startup as the night before--woosh of the fans starting, the harddrive twitches, then it doesn't sound like anything happening in there, everything at idle. I'm out of warranty, (and consequently will never let any of my other macs go out of warranty again), and this *****. By chance any way you could explain to me where to look for these "LEDS" in the imac, i think i'll open it up to confirm that i have the same condition as the original poster. Such a weird problem... i'm so dissatisfied about this though... PLEASE HELP!

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Imac G5 20" makes startup sound, and fan kicks in, but screen stays black

Hello. I have read the many similar postings and tried alot of ideas with no luck. Here are the specs on the model:
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When you push the power button, you get the bootup sound, and the fan turns on. Then 30 seconds later, the fan goes into hyperdrive. The whole time the screen stays black. I have tried resetting the pram, get no sound then. I have tried the internal startup button below the fan housing, and it does NOT have the 2nd button there as it is an ambient light model. So I held the power button and plugged in the power cord, still nothing. When plugged in, the 1st green light lights up on logic board. When I hit the power, the 2nd green light lights up. I have tried an external monitor with the adapter plug and still no picture. I do not even hear the hardrive try to read. Could it be a power supply? What are the other 2 lights on the logic board for, as there are a total of 4? I have not tried to boot from a cd or change the battery yet. I don't know if there is a point in doing that, as the screen remains black. I cannot use a conventional pc power supply tester either. Any other ideas on this situation?

"Could it be a power supply?"
More than likely if everything else possible has been ruled out. Your model G5 had an extension repair program which has long expired for your exact issue. Shame you missed it.
"I have not tried to boot from a cd or change the battery yet. I don't know if there is a point in doing that, as the screen remains black."
You won't know if it will do any good until you at least give it try. You should also run Apple's Hardware Test from the Install DVD #1. The DVD label will tell you which key to boot up from to run the AHT.
A few links to check out:
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)).
http://support.apple.com/kb/TS2094 iMac G5: Troubleshooting when there's no picture on the display
iMac G5 Support
You could also try cleaning the interior of your comp.
See KB Article: http://docs.info.apple.com/article.html?artnum=300205 iMac G5 DIY (Do-It-Yourself) Instructions
iFixit has detailed take apart instructions.
Search YouTube for G5 iMac (your model) “How To” tutorials.
Your final solution may be to take comp to your local Apple Store or an AASP.
Good luck!
!http://i45.tinypic.com/jl0z95.jpg!

IMac giving problems at startup - keep getting the spinning disc

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Shut down the computer.
Unplug the computer's power cord and all peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
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Hold the keys down until the computer restarts and you hear the startup sound for the second time.
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Elusive,
Any luck finding an answer? I have a similar problem.
My Hard Drive fan is running 5000-5500rpm all the time.
I've followed the instructions for resetting the SMC:
http://docs.info.apple.com/article.html?artnum=303446
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My setup:
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If you use the iMac's built-in speakers for sound when using the iMac, the startup sound reflects the volume setting for the built-in speakers.
If you use headphones or external speakers connected to the headphones port on the iMac, that volume setting is stored separately (from the built-in speakers). To mute the startup sound, disconnect anything in the headphones port, so that the iMac is using the built-in speakers. Set the volume to mute.
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Continuous beeping sound on startup no display,fan is running,power light is off ?????

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IMac G5 – Won't startup except in Safe Mode (10.5.5). Otherwise Blue Screen

I’ve had my iMac (pre-iSight) for about 3 years now and up until recently never had any major problems with it, despite using it for about 12 hours per day, every day.. A couple of minor problems however had developed, but several months ago and didn’t seem to affect the system:
(1) Software update stopped working (had to download & install updates manually) &
(2) Couldn’t verify or repair permissions (even pre 10.5.5. Even when I tried to repair them from another startup disk, the message I got was ‘no package receipts’ – although I could see that they were there in the “receipts” library folder)
A couple of days ago I decided to try and fix the problems by erasing my startup disk (after backing up all my data of course) and re-installing 10.5 from the installation DVD and then bringing the system up to date. At the time I did this I hadn’t upgraded or installed any new software for several weeks.
For about one day after that it worked fine. The only ‘alarming’ thing that I noticed during that day was that whilst playing a movie the CPU temperature rose to about 89 C. (I use Temperature Monitor). I read somewhere that the CPU temperature should not exceed 85 for this model and that if it did the system would either shutdown or go to sleep, so I was surprised to see it go as high as 89 (assuming that the right temperature was being reported) before it went to sleep. However, even after that it, it started up correctly a couple of times.
Since then it will only boot in Safe mode, and when it does it carries on working indefinitely without any problems. The only thing that I lose in safe mode which seems odd – in addition to all the things that I know I should lose – is Audio. The preferences panel says: no input, output devices attached (ie not even the ones built-in).
If I try a normal start up, the system will go through the grey screen, apple logo, spinning ‘cog’ etc and then almost always go to a blue screen where it stays put. There is a black cursor in the top left corner which, when I try to move it, duplicates itself so that I end up with 2 cursors – one which moves and one which stays in the top left corner.
On very rare occasions (about 1 time in 20) during a normal startup the system will get past the blue screen and to my desktop (in fact this happened several times consecutively before I got to the point where I could only startup in Safe Mode). However, moving the cursor into the menu bar or into the dock would result in the whole screen freezing – the cursor would move, but nothing else would happen). Also I would see that several pixels were ‘missing’ from the desktop. The desktop is normally solid green, but I would see 3 or 4 red and black pixels.
I’ve studied all the forum topics that even remotely resemble my problem and tried just about everything I can think of including:
1. Resetting SMU & PRAM (repetitively)
2. Running the Apple Hardware Test – All tests passed
3. Replacing the PRAM battery
4. Check that the fans are working (I can hear them and when I take the back off, both fans spin)
5. Erased the disk again, installed the OS from the installation DVD, so that there is no third party software on the system. (and then tried a normal boot both with the original 10.5.1 and 10.5.5 after applying the combo update).
6. I have several external disks with several copies of the OS on various partitions, including a 10.4.11, but trying to boot from any of those ends with the same result. I can only boot in safe mode, other wise I get a blue screen (or very rarely it will squeak through to the desktop & then immediately freeze).
Always the same result – safe boot only.
From reading through the various topics, I get the feeling that my problem may be related to the graphics card, but if that is the case I don’t understand why the system will always boot in safe mode and then run without any problems all day. It even allows me to play movies: very jerky (and no sound), both when I move the QT window and the images themselves, but it still plays.
Any thoughts on what the problem might be (other than fatal) would be greatly appreciated. Or an explanation why, if it is the graphics card, the system will continue working after safe boot.
I’ve copied out the system details from Profiler that I think are relevant below.
All the ‘x’’s in the the ROM revision for the ATI Radeon card look a little odd – never seen that before and I don’t know how long its been there.
Model Name: iMac G5
Model Identifier: PowerMac8,2
Processor Name: PowerPC G5 (3.0)
Processor Speed: 2 GHz
Number Of CPUs: 1
L2 Cache (per CPU): 512 KB
Memory: 1 GB
Bus Speed: 667 MHz
Boot ROM Version: 5.2.5f1
Serial Number: W8539……
ATI Radeon 9600:
Chipset Model: ATY,RV351
Type: Display
Bus: AGP
Slot: AGP
VRAM (Total): 128 MB
Vendor: ATI (0x1002)
Device ID: 0x4150
Revision ID: 0x0000
ROM Revision: 113-xxxxx-117
Displays:
iMac:
Display Type: LCD
Resolution: 1440 x 900
Depth: 32-bit Color
Built-In: Yes
Core Image: Software
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Not Supported
Display Connector:
Status: No display connected
Many thanks for your help

I had a very similar problem with my 20" iMac G5 ALS running 10.4.11. It began with random freezing inside the OS and intermittent slow booting, but quickly progressed (over a matter of days) to hanging at the blue screen before the logon window, just as you described.
I too, found that booting in Safe Mode was successful. I ruled out the airport card by manually installing that kernel extension in Safe Mode. A check of the logs pointed to "ATY" which I've since found out is a reference to the ATI drivers, which brought me to this post.
At least on my system--and I have tested this on Tiger (10.4 and 10.4.11) and Leopard (10.5 and 10.5.6), the only .kext that needs to be removed / renamed is ATIRadeon9700.kext. My preferred method of doing this is to drop to the terminal and type:
sudo mv /System/Library/Extensions/ATIRadeon.kext /System/Library/Extensions/ATIRadeon.kext.disabled
This preserves the relevant permissions and ownership, which you'd otherwise have to reset manually if you copy the file elsewhere and then delete the original in the Finder, and then want to restore it to its original condition, BTW:
sudo chmod -R 755 /System/Library/Extensions/ATIRadeon.kext
sudo chown -R 0:0 /System/Library/Extensions/ATIRadeon.kext
Any OS X update will replenish the file, so you should be at the ready to reboot into Safe Mode the first time and rename the file again.
The downside to all this is that the video acceleration doesn't work, so graphics operations are slow and jerky, but at least everything else seems to be okay, in my case anyway.
Popping open the case did indeed reveal four bulging capacitors. I bit the bullet and purchased some replacements, part number 647-UHN0J182MPD from Mouser:
http://mouser.com/Search/ProductDetail.aspx?qs=pjJ%252bhmlZec6zHXGt6EoiHw%3d%3d
Although I wasn't looking forward to desoldering my logic board, I wasn't real hopeful that I'd have success getting the local Apple shop to replace it under warranty either. I did find some helpful information on performing the fix yourself:
http://jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php
And I do want to be able to sell this thing for at least a little cash to help offset the cost of a new quad-core iMac, whenever they're released.
Fortunately, for me, the service tech at the Genius Bar at the local Apple store agreed to fix it under the power and video extended warranty, even though it was slightly outside of the warranty period, due to the fact that I had brought it in about a year ago and had the power supply replaced under the same warranty.
I almost didn't bother to bring the machine in because it's a real nasty day here today, and I figured they'd just tell me "That'll be $800 to fix it," and I'd end up doing surgery on the logic board anyway in addition to carrying the thing up and down the steps to my condo. Boy am I glad I did, though. Apple customer service rocks.

Can you hear the fans on iMac? (my new 2011 27'' i5 fans are constantly audible even from a distance)

I have the 2011 27'' Imac i5 and I can hear the fans all the time as of start. It's not super strong but clearly audible even from distance. istat shows normal fan speeds (1100/1300/1000 respectively) . The noise bothers me a lot especially in a silent room. The fans start to be audible immediately after switching on and get higher (+temperature rises significantly) under any easy activity .. like streaming a video from net.
Can you hear the fans on yours at all?

Do a SMC reset (maybe do it 2-3x) and if the problem persists as you have been advised call AppleCare.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Roger

How do I mute the startup sound

How do I mute the startup sound on my imac

The start up sound is there for specific reasons, for example if you do a Safe Boot or PRAM reset you need the start up sound to do those key functions. I would recommend against masking it and follow Apple's suggestions. Please read your owners manual, where Apple states:
Putting Your iMac to Sleep
If you‘ll be away from your iMac for less than a few days, put it to sleep. When your iMac is in sleep, its screen is dark. You can quickly wake your iMac and bypass the startup process.
This means don't turn it off, my iMac is about 5 years old now. The only time it's restarted is when I'm doing updates, it has reliably that way and has never given me any problems. In short, let it sleep when it's not being used.

How do I enable the startup sound on Mac OS 10.2.8(Jaguar)

Three things
1.How do I enable the startup sound on Mac OS 10.2.8(Jaguar)
I am using an iMac G4
I like the startup chime of mac osx but it doesn't seem to be chiming when I turn the computer on.
2. How do I get safari+flash player on 10.2.8
3. How do I update the computer (e.g. Windows update kind off thing)
Please help.
Cheers,
Mittens131

1. Make sure the volume is on. Check that the machine makes other sounds.
2. Here is a link for Safari for a Mac 10.2.8
http://support.apple.com/kb/HT2964
Though I'd be surprised if it would be very useful. Things have changed a lot on the internet since that came out. An old version of Firefox might be better. I don't know where you would get an old version of flash. It is an Adobe product.
3. There are no further updates to Jaguar 10.2 than you already have, 10.2.8 that was the last update.

How do I turn off startup sound?

Every computer I ever had, the first thing I do is to turn off the startup sound because it is very annoying in a public place and sometimes in a quiet place. I have not been able to find out how to trun it off on my Air. I asked the guys at the stores and they just say you can't. That is really dumb. I turned off my speaker but that is not a practical way because I may not remember to turn it off when I shut down.
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Love to know.
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NONE OF THE ABOVE WORKS FOR ME!
imac/Mac OS X Lion 10.7.5
I find this great solution...
<This is a Direct Download Link>
MuteCon for Mac OS
or go to http://homepage1.nifty.com/macbs/download.htm#MuteCon
mutec202.dmg(90.3KB)(recent version)
is a japanese site but the app is in english.
this app mute the sound before exit and demute after boot.
works with Lion/snow leopard/ Mointain Lion
set the preferences like this
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So easy...I can not believe I lost so much time.
Help to spread the word!!!
<Edited By Host>

IMac 2.4GHz - No startup sound, no fans spinning

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