My iMac has recently been turning itself off whilst in use but over the last day or so the screen has become unreadable. It looks like its covered with a net curtain. The programs run OK in the background but you can't see them to do any work. When restarting the Mac it makes a lound electronic howl before opening. Whereas I could get a proper screen previously it is always distorted now. It was suggested that the video card on the logic board has failed which means a repair of c.£650 which I cannot afford (or to buy a new Mac). The serial number does not apply to one of Apple's known faults unfortunately. Any ideas? Apple have not yet had a look at the machine.
I will try to give you a troubleshooting if you haven't done so.
first you could try is a PRAM reset, that might help to reset the paths of the logic board with internal components.
If that does not work try to reset SMC/PMU (power Management Unit) to see if that helps.
http://support.apple.com/kb/HT1894 (article with PMU instructions)
If that does not work and you want to know the issue, try to boot in verbose mode:
http://support.apple.com/kb/HT1492 ( this is the article in apple tech support that explains how to do so.)
When you do that,(in case you can see the log) it will tell you what the machine does while booting.
Try connecting to another screen too to see if it is the screen.
Let me know if this helped, if not I can try to give you a workaround.
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The first thing I would do is boot up in safe mode see http://support.apple.com/kb/ht1455 this will boot the imac up without extensions on that includes video extensions which could be the source of the problem. See if the screen works after this, if it does it could indicate that the either video card is not operating properly or one of the drivers isn't. If you then search on google for your model of card and see if this is a known problem and you could find a work round. If it boots up as you have described it in your email it's a possiblity that the card is no longer functional and it will be expensive to repair.
The iMac G5 and iMac G5 (Ambient Light Sensor) computers have a video out port located on the back of the computer, which will mirror video. Video mirroring means you can see the same image that is on the iMac G5's flat-panel display on an external monitor, television, or projector. Using the video out port, you can mirror video with a compatible VGA display using the Apple VGA Display Adapter. You can also use the video mirroring feature with a television or projector that has S-video or composite video connectors when you use the Apple Video Adapter. Both the Apple VGA Display Adapter (M8639G/A) and the Apple Video Adapter (M9109G/A) are available separately, and are needed if you want to use your iMac with a VGA monitor cable, S-video cable, or composite video cable. The video mirroring feature is "plug and play". Simply connect a VGA display, television, or projector to the appropriate adapter (see above), then connect the adapter to the video out port located on the back of the computer. When you connect the adapter to the computer, the screen may refresh momentarily as the computer prepares itself for the new video output. The computer tries to match the resolution of the built-in and external display. If there is no match, the computer changes both screen resolutions and may black out areas on the built-in display in order to match the capabilities of the external display. Important: To ensure that your iMac G5 automatically detects the external display or projector, be sure you plug the adapter into the external display or projector before you plug it into the iMac G5. You can switch resolutions and frequencies for both the iMac G5 flat-panel display and the external display, television, or projector using Displays preferences. Want to watch a DVD movie disc on a television that's connected to your iMac G5? Select a 720 x 480 NTSC (in the United States) or 720 x 576 PAL (in Europe and other regions) resolution in Displays preferences. Tip: Because of the display limitations of most televisions, the images displayed on a television screen are usually not as high quality as those on the built-in display or an external monitor.
I have one doing exactly this at the moment. It had gone to sleep and the fans were going like crazy.
I think it is a Motherboard failure (it happened with many G5 iMacs), this one has been replaced once already, and I can't actually get it to install anything.
I'm taking it apart tomorrow to see what I can find inside. If I fond anything I'll let you know.
Hello, Sorry to hear you are having troubles,
Is this a 17” iMac G5, if it is, and I think it is, unfortunately, this iMac model was generation 1 of the all in one flat screen design and it's a bit of a Lemon... The hard Drive overheats the video card and the power supply. With time, these 2 elements burn out.
What you have sounds like the power supply.
it's a $300 repair, but, it might not be a good investment for you, the new power supply won't last much more than the first one and your video chip won't last much longer....
Best put the money and put it towards a new machine.
Sorry bout that.
Your Imac may be one of those affected by Apples purchase of inferior capacitators from Taiwan. If you are less than 3 years from the purchase date, apple will repair the problem for you for free. Just take the unit to your nearest local Apple Genius or tech. If you are outside of the repair extension guidelines, I have provided a link here which can show you or someone more skilled how to repair the problem. Ordering a new motherboard and power supply will set you back a lot of money, however the following guide and pdf give you step by step instructions on how to ressurrect your dead imac without speding more than $100.00. I was able to repair my imac using this guide and it was worth it to save a $2k computer that was only 3 1/2 years old. Check it out:
the following information (in italics and bold) is taken directly from: http://www.jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php. (this site is complete with instructions, manual and the full compliment of materials available at an extremely affordable and fair price. I took a chance and repaired my own, it is not as hard as it sounds1)
The iMac G5 Repair Extension Program for Video and Power Issues applies to first generation iMac G5 computers that have video or power-related issues as a result of a specific component failure. If your iMac G5 is exhibiting any of the symptoms listed below and your computer's serial number is within the noted ranges, your computer may be eligible for repair, free of charge. If Apple or an Apple Authorized Service Provider (AASP) determines that your iMac G5 computer is eligible as part of the program, the repair will be covered by Apple for up to three years from the original date of purchase even if your iMac G5 is out of warranty.
This is a worldwide Apple program. Affected systems will exhibit one of the following video- or power-related symptoms: Scrambled or distorted video No video No power Note: If your iMac G5 is not experiencing any of these symptoms, you do not have to contact Apple or any Apple Authorized Service Provider.
Which iMac G5 computers are affected by the iMac G5 Repair Extension Program for Video and Power Issues? The program is available for certain first generation iMac G5 models that were sold between approximately September 2004 and June 2005 featuring 17- and 20-inch displays with 1.6GHz and 1.8GHz G5 processors.
The affected iMac G5 computers have serial numbers where the first 5 digits fall into the ranges noted below.
Serial Number ranges: W8435xxxxxx - W8522xxxxxx QP435xxxxxx - QP522xxxxxx CK435xxxxxx - CK522xxxxxx YD435xxxxxx - YD522xxxxxx Some second generation iMac G5 computers have serial numbers that fall within the upper band of the ranges listed below. Only first generation iMac G5 computers are affected by this program. Where do I find the serial number of my iMac G5? The 11-digit serial number is located on a label under the foot of the iMac G5. There is a bar code underneath the serial number. To view the label, hold the sides of the iMac and gently lay the computer face down on a soft, clean towel or cloth.
Is the iMac G5 Repair Extension program available for other Apple computers?
This program applies only to the systems noted in this FAQ. Other versions of the iMac G5 line are not part of this program. Click here for more information on how to identify iMac G5 models
Free guide for how to repair the motherboard capacitors, rescue the hard drive and more.
Mine is doing something very similar now. I managed to do the Apple Hardware test and it came up with the Error Code 2 FAN/5/7: Hard Drive. This leads me to believe that the problem is the fan by the hard drive. Your problem may be the same thing. If so, it's just a matter of finding the part and the installation instructions (on the Apple web site).
Try the Apple Hardware Test from the Mac Os Software that came with the computer. You install Disc 3 and shut down the computer. Then turn it on and right away press C on your computer. This action will take you to the Hardware test. Press one of the buttons that does the test and see what results you get.
If you get the same error code you might want to check out welovemacs.com for the fan.