IMac g5 20" iSight no display loud fans white light

Hi,
Wondering if someone can help at all,
I've recently been given an iMac which needs repaired,
It seems certain parts have been stripped from it but want to make sure nothing else is wrong before buying replacements.
When I plug in it, I get the white light in the bottom right corner, fans go quite loud after around 5-10 seconds, and no display, also bad smell but think it could be because the previous owner smoked alot.
When I opened up the iMac, the hard-drive was missing and from what I can tell the hard-drive bay too, along with the ram & cd drive.
If I buy these will the mac work or is there another problem
iMac Details :
20-inch iMac G5 (iSight), 2.1 GHz
MA064xx/A
Thanks

Hi,
Thanks for the reply, I've just managed to work my way through to the capacitors and they seem to be fine, looking at the soldering I would say they may have already been replaced on the logic board.
Anyone have any other ideas?
Would love to get this working again, Just need to replace what was stripped.
Thanks again

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Hi MacGruff69
That has all the classic signs of unseated, improperly seated or bad RAM.
Laying the iMac face down on a soft towel and reseat the module(s) by pressing real hard on each one with both thumbs, then closing the ejector clips and replacing the cover.
http://support.apple.com/kb/HT1432
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http://eshop.macsales.com/shop/apple/memory/iMac/IntelCore_2Duo
Dennis

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As stated: our Mac won't turn on other than the white light on the bottom right.
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A steady LED light generally indicates that the computer is on and the display is asleep.
Before you get inpatient and start taking out screws or trying to open it up, which is not an easy task on that model.
Reset the SMC, as per > Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
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Hi all,
I love my iMac. I've had it for nearly 8 months now. From day 1, I've been surprised by how loud it is under any significant CPU load. Unfortunately for me, I have waited until I'm well out of my phone support window to do anything about it. I have not yet purchased AppleCare.
As I type this, my CPU temp is 70 degrees C and fan is running at 2600 RPM, running nothing beyond the browser in which I'm typing. Should I attempt to work in iMovie and render said work to DVD (the reason I bought the machine), CPU temp will climb to ~76 and fan speed jumps to 4600-4800 RPM. At this speed, the noise is unbearable...but it is annoying even when idle.
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I'm getting a system board replacement tomorrow, but have been told not to expect it to make a significant difference. I figure I must do it before Apple would consider further action.
Any advice at all will be greatly appreciated. Sorry for the long message...
Thanks,
ctcaldwell
iMac G5 17" Mac OS X (10.4.5)

Mine is still fairly new as I picked it up off ebay a couple weeks ago brand new. So I don't know when it was actually manufactured. The part of the noise that gets under my skin is that soft but constant background whining coming from the CPU fan. It doesn't really sound like anything rubbing or a bad bearing, just the sound that an electric motor makes. But, it just seems to resonate from the lower left hand side where the air intake is.
So quite accidentally one day I held my hand under the left hand side and it completely muffled the whine sound. You could still here the hum and the sound of air but the irritating element was gone. Playing around a little more, I opted to tape a business card under that lower left hand corner, bridging the gap from front to back to still allow an airspace for the fan's suction. It knocks out about 90% of the whine.
It's been running that way for two weeks with no ill effects. Yes, the fan speeds up and slows down when needed. Normal at rest RPM is 1500 and mid to upper 50's on the temp. The highest temp I've seen under max continuous load is 65 with the fan at 4000 rpm.
I did experiment with something longer than the business card but I did then see a decrease in cooling capability. The isight models have their suction ducted out the back and I bet that gets rid of that resonance.
So all in all it still makes less fan noise than my old B&W, it's just that the B&W wasn't up on the desk so close to our heads. But, If your fans are constantly on high, there is a procedure for resetting something in power management, I just can't find it right now. Hope this helps.

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Your video chip seems to be failing, see if you can boot from your install disc and run Apple Hardware Test to check things out. After that, you can run Disk Utility
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Alex Cummaudo wrote:
I've noticed that the main fan will spin, on average, at 1200rpm. Is that normal? The iMac is very well ventilated and sits right next to a window...
That's the default fan speed on iMacs, so there isn't any problem with this.
Alex Cummaudo wrote:
I have also boot camped the iMac with a copy of Windows 8 so I could run some fairly power-hungry games. I intentionally purchased a high end iMac (27" display, Intel Core i7 3.4GHz, Nvidia GeForce 680MX Graphics, 1TB Fusion drive) and expected the iMac to run games flawlessly. However, after a few days, I noticed that the CPU and GPU had shot up to a worrying 80°C whenever I ran power-hungry games, with a very loud hissing noise from the fan. After running games for about 10 minutes, the fan will stop hissing, causing the GPU and CPU to increase to 100°C. The iMac then fails and switches off unexpectedly without any warning. After analysing the Windows event logs, I received an event ID 41: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
You must know that Boot Camp isn't compatible with Windows 8 and that Apple hasn't released drivers for Windows 8, so it can fail. Install Windows 7 inmediately until Apple launches updated drivers.
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Not that this will cure it but it may help:
As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
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SMC RESET
http://support.apple.com/kb/HT3964
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.
It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

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http://i3.photobucket.com/albums/y93/thisismymind/untitled.jpg
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MyrkridianRhapsody wrote:
Hi - I have an iMac G5 17" iSight. Specs are 1.5 Ghz G5, 2.5 GB RAM, 150 GB Hard Drive and SuperDrive. The Hard Drive is wiped clean, I boot it with an external FW drive running 10.5.7.
Here are the issues: As soon as the machine boots, the LCD shows 3 permanent vertical lines on the screen. This is as soon as it displays anything, from the initial Apple logo all the way until shutdown. While it is on and booted up to the desktop, it runs fine, except sometimes it will randomly refresh the screen or change resolutions. These are the only issues.
While I am quite sure it is one of three things (inverter, video cable or LCD), I still took the typical troubleshooting approach and tried any quick fixes I could. These included-
1. Boot off of known good OS
2. PRAM Reset
3. SMU Reset
4. Reseat RAM
All of these had no effect. From there I tried two more things-
1. External display via mini VGA
2. Ran Apple Hardware Test
3. Ran LCD tester
The external display worked perfectly, which tells me that it isn't the GPU/logic board. I ran AHT and the logic board passed both quick and extended tests. During the extended test I got an error for the ATA bus/drive, but I haven't looked up the error code yet. Everything passed in the quick test. I used the LCD tester, which puts solid colors on the screen (Red, Green, Blue, White, Black). The 3 lines run across the whole screen vertically, and cannot be seen on a solid white screen. On the solid black screen they show up yellow and purple.
Here is a screen shot showing the three vertical lines-
http://i3.photobucket.com/albums/y93/thisismymind/untitled.jpg
I was wondering if there is an easy way to diagnose this just by looking at it. I was figuring replacing the inverter and/or the video ribbon cable first before replacing the LCD... but if anyone here can diagnose it easily than that may save some time.
Thanks in advance!
Hello MyrkridianRhapsody,
(1) Until you get the answers you need, you might get better help if you turn off the
at the top of your post showing that "This question is answered."
(2) Also, the link you include does NOT seem to show a screen shot of an iMac G5 17" iSight. Please:
(2a) clarify whether this thread relates to the same problem as your other current threads,
(2b) confirm which Mac is the subject of this post, and
(2c) either correct the posted link or explain what the linked image shows.
(3) If this thread is posted in error, please confirm that you do not need assistance here.
We will offer specific suggestions based on the details in your reply.
Cheers,
EZ Jim
G5 DP 1.8GHz w/Mac OS X (10.5.8) PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight

Loud fans in sleep mode 20" G5 iMac Rev A, OS 10.4.11 New Info

This is more of a confirmation and heads up on a problem I encountered and solved to see if any of you have other ideas.
Several weeks ago I replaced the power supply bought from Mac Pro Online in my G5 iMac. When I put it to sleep I hadn't noticed anything odd at first because I'ld just walk away until one day I could here the fans going full blast. The screen was off as usual but the sleep mode light wasn't on while the fans were running. I waited about a minute until the fans returned to normal speed and the sleep mode light returned to its usual behavior only it seemed to be a lot brighter.
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There's no telling.
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< Edited by Host >

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4SNS/1/C0000008: TL0p-- 124
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Why does my I MAC boot but shows no display and fan is loud?

Why does my I MAC boot but shows no display and fan is loud?

Reset the SMC a couple of times and then post back. Instructions are:
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Attach the computer's power cord.
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IMac g5 20" iSight no display loud fans white light

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