Question about Apple iMac G4 Desktop

1 Answer

Pixelated titanium g4

Hey JSPC....
i have a screen that 'seems' intermittintly going into HEVAVY PIXELATION...
but when i plug in a DVI connector (not connected to any device) it MOSTLY goes away.... when i un-plug it, it;s better for a minute or 2 and the returns...
MOTHERBOARD? ....
thanks
rd@nynoise.com

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

  • Apple Expert
  • 250 Answers

Your logic board and graphics chips are fine. But it's possible that some of the settings have been corrupted which is causing the problem. To rectify this, first of all in the Display settings (in the system preferences) click the button to 'Detect Displays'. If that doesn't help it you just need to reset the PRAM. Here are the links to the Apple site for instructions on how to do this:

http://support.apple.com/kb/HT1379?viewlocale=en_US

If the computer is a PowerBook (as inferred by 'titanium' in your subject heading) rather than an iMac then you can also reset the PMU:

http://support.apple.com/kb/HT1431?viewlocale=en_US

That should hopefully sort it out. By the way, just to help us out when giving a diagnosis be sure to put the item in the correct category (Titanium g4 isn't an iMac) just to avoid confusion.

All the best
Sean

Posted on Dec 25, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What can I do to stop by iMac G5 LCD screen from being pixelated and getting dark blue and pink horizontal lines across it?


This very likely a failure in the LCD screen. If you are seeing thin or wide bands, vertical or horizontal across the screen, then you will need to have the unit serviced to repair or replace the screen. If the unit has been dropped or struck (hard) it is possible the connector cable for the screen has come loose, but this is not usually the issue. If the unit is still under warranty, get it serviced. If it is not under warranty, there are several good web sites that provide Do-It-Your-Self instructional videos as well as parts, both new and refurbished and used. If you google your specific model and "screen replacement", you will see a number of results appear that would be of use.

Apr 19, 2013 | Apple iMac G5 Desktop

Tip

Connect you HDTV to your Mac.


One of the first things you may notice about your new big-screen HDTV is that it has more connections for video than your old TV ever dreamed about. It probably has two or three HDMI connections, maybe a DVI connector, a VGA connector, and at least one component video connection. And those are just the connections most commonly used for high definition.
It’s shame to let all those connections go to waste. Your Mac just happens to be sitting nearby; why not hook it up to your new HDTV? It's actually a pretty easy task. A few lucky souls won't even need an adapter; for the rest of us, at least one adapter will be necessary.
Pick the Right HDTV Port For best quality, your HDTV's HDMI or DVI ports are the preferred connection method. Both are capable of the same digital quality. The only practical differences are the style of the connector and the fact that HDMI supports video and audio in a single connection. If it has one, another option is to use your HDTV’s VGA port. The VGA connection isn't as good as the HDMI or DVI method, but as long as your TV supports full resolution via the VGA port, you'll be hard pressed to notice the difference. Mac Pro, MacBook Pro, Mac Mini Mac Pros, MacBook Pros, and Mac Minis have standard DVI connectors. Mac Minis and MacBook Pros have a single DVI port; Mac Pros have at least two DVI ports. If your HDTV has a free DVI port, then all you need is a standard DVD cable; no adapter is necessary. But in all likelihood, you'll need to connect your Mac to your HDTV using either an HDMI or VGA connection; both options require an adapter. If you choose VGA, you can use the adapter that came with your Mac. If you choose HDMI, you'll need a simple adapter, which is available from multiple sources. The adapter may be a cable with a DVI connector on one end and an HDMI connector on the other, or it may be a small adapter that has both types of connectors, but no cable. Either type will work fine. iMac, MacBook iMacs and MacBooks have a mini DVI connector for hooking up external monitors or TVs. You'll need at least one adapter, maybe even two. At a minimum, you'll need a mini DVI-to-DVI adapter. You may also need a DVI-to-HDMI or DVI-to-VGA adapter, depending on which port on the HDTV you choose for the connection. Make the Connection Once you determine which, if any, adapters you need, and have the necessary cable to reach from your Mac to the HDTV, turn off both the HDTV and the Mac. Connect the cable between the Mac and the HDTV. Turn the HDTV back on first. It doesn't need to be set to the connection the Mac is on, but it must be powered up first, so that when it boots, your Mac can recognize the TV and the resolution it needs. Once the HDTV is powered up, turn on the Mac. Your Mac should recognize the format and resolution of the TV, and automatically select the native resolution of the TV for running the video. In a few seconds, you should see the Mac desktop on the HDTV. Over or Underscan You may notice that the Mac's desktop appears to be slightly larger than the HDTV's screen (its edges are cut off); this is called overscan. Or, you may notice that the desktop doesn't occupy all of the HDTV's screen real estate (there are dark areas around the edges); this is called underscan. You can usually correct either issue by making adjustments on the HDTV. Check the HDTV's manual for information on making scan-related adjustments. They may be called overscan, underscan, dot-by-dot, or pixel-by-pixel. If your HDTV has a dot-by-dot or pixel-by-pixel capability, give this a try; it should eliminate any over or underscan issues. Some HDTVs only offer these special scan controls on specific inputs, so be sure to connect to the corresponding input on your HDTV. Time to Watch a Movie Once you have your Mac and HDTV working together, it's time to kick back and watch a video from your Mac. Be sure to check out the QuickTime HD trailers for a sense of what HD and your Mac is capable of. Enjoy!

on Feb 22, 2010 | Mac Desktops

1 Answer

Imac g4 freeze restart


This is a sign of memory issues with your Mac. Replacing the memory should not be very expensive.

Oct 10, 2012 | Apple iMac G4 Desktop

1 Answer

Photos print with vertical lines and don't show true colours as displayed on the computer screen. Printing directly from camera is fine , so not a printer problem . Have calibrated computer but no...


Try cleaning the USB cable connectors. Take a q-tip with rubbing alcohol on it and wipe it down. make sure the connector is fully dry before reconnecting.

Dec 03, 2010 | Apple eMac G4 Desktop

2 Answers

Whenever I turn on my desktop the screen just stays black.


It appears that your power supply is good, the startup chime says that the system board has passed self diagnostics. If you have a black screen then the problem is either the video card or the screen itself. Unfortunately it is very difficult to tell which one. You might try to use an external monitor. If it works, then the problem is with the LCD.
To use an external monitor you need a Mini-DVI to VGA adapter, or a Mini-DVI to DVI adapter if your display will use a DVI connection. Either adapter is available at any Apple retailer. The connector on the back of your Imac is next to the ethernet connector, and should be the last in the row.

Apr 27, 2010 | Apple iMac G5 Desktop

1 Answer

Trouble connecting Power Mac G4 Airport saying "invalid password"


WPA is supported by both the Airport Extreme and Mac OS versions 10.3.
It's possible you need to change your encryption specification on the Netgear to "Shared Key" instead of the default "Open."

Feb 28, 2010 | Apple Power Mac G4 Desktop

1 Answer

Graphics, missing hard and disk drives,


YOUR MAIN BOARD HAS A PROBLEM JUST TAKE TO A APPle service center

Jan 03, 2009 | Apple Mac Desktops

1 Answer

Imac question


Try turning it on with the shift key down. This gives a safe boot. If it's going to turn on at all, it will turn on then. Also, boot it with Disc Warrior or Tech Tools and run some tests to see what is going on. I hope you find all is well, and that the repairs are just minor. Good luck.

Sep 19, 2008 | Apple iMac G4 Desktop

2 Answers

Mac Mini G4 Flickering Screen at Start Up


Did you check the wires?  Sometimes if you pull one loose it flickers.

Aug 13, 2008 | Apple Mac mini G4 Desktop

Not finding what you are looking for?
Apple iMac G4 Desktop Logo

119 people viewed this question

Ask a Question

Usually answered in minutes!

Top Apple Mac Desktops Experts

Lawrence Oravetz

Level 3 Expert

7686 Answers

Cosma Papouis
Cosma Papouis

Level 3 Expert

404 Answers

Brad Brown

Level 3 Expert

13542 Answers

Are you an Apple Mac Desktop Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...