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The 17" iMac (White, Early 2006) - MA199LL/A was released in 2006 and features a 1.83 GHz Core Duo processor and 17" display. Graphics processing is handled by an integrated Radeon X1600 graphics card with 128MB of VRAM. The standard model shipped with a 160GB 7200 RPM 3.5" Hard Drive and 512MB of PC2-5300-667MHZ-DDR2-SO-DIMM RAM. The device was released on January 10th 2006 with a MSRP of 1299. Overall dimensions are 16.9 x 16.8 x 6.8 inches with a weight of approximately 15.5 lbs.

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The Computer Turns On But The Screen Isn't Displaying Anything

Okay So When I Would Turn The Computer On The Screen And Computer Turns On But The Screen Is Displaying Black And When I Would Turn Off The Computer I Would See The Screen Turn Off But When I Turn The Computer Back On The Screen Still Displays Black And Still Makes Noises

I've Tried This

  1. Replace The CMOS Battery
  2. Reseat The RAM
  3. Boot From USB And Reinstall MacOS

But It Still Works The Same Way It Would, How Can I Fix It? Hopefully It Can Get Fixed And I'm Not Doomed :(

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@kimbelkeener "Still Displays Black And Still Makes Noises" what kind of noises?


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Does it chime or make sounds indicating it's booted up? If you adjust the volume with buttons on the keyboard does it make sounds?

Most of these iMac G5s suffer from defective capacitors on the motherboard and one of the symptoms is the machine doing "something" when powered on but not booting correctly. If you take the back of the computer off, you can inspect visually. Bad capacitors will look something like this, with their lids bulging and / or leaking:

Block Image

This problem is incredibly common on these computers and requires some serious soldering skills to fix.

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The Capacitors Are Probably Not Leaking And It Doesn't Make Any Sounds

I Opened It To Replace The CMOS Battery But It Still Doesn't Power On And The Logic Board Has No Leaky Capacitors Otherwise I Would Have Seen It And Bought New Capacitors


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@kimbelkeener I got a suspicion here :-). Try this first:

No Video, Boot Chime heard, White LED ON (Symptom 2)
The iMac (17-inch Late 2006) will turn on, the boot chime can be heard, a white LED appears on the front bezel and sounds from the fan or drive activity can be heard, but the display has no picture or color.
1. Check if the computer is sleeping. Press the space bar to wake the computer from sleep mode.
Did the computer wake from sleep?
Yes: Put the computer to sleep from the Apple menu and wake the computer again to test.
Check Energy Saver setting to see when the computer has been designated to sleep.
No: Continue to next step.
2. Reset your computer’s PRAM (Parameter RAM):
- If your iMac is on, turn it off by holding the power button until the unit powers off. You should hear the fans go quiet.
- While the computer is off, with your left hand, hold down the Apple key, the Option key next to it, and the letter “R” key on the keyboard. When you have these keys all pressed down, push the power button with your right hand and then quickly move that hand to hold down the letter “P” on the keyboard. Keep these four keys pressed while the computer starts up.
- Make sure you hold down the four keys (P - R - Apple - Option) while the computer is starting up. When you hear the computer’s start up chime for the second time, you can let go of the keys on the keyboard. If you didn’t hear at least two startup chimes, go to the top of this section and begin again. It’s important that you hear two startup chimes when performing this procedure. This indicates that you have successfully reset the computer’s PRAM (Parameter RAM).
3. Does the computer display video after successfully resetting the computer’s PRAM?
Yes: Restart the computer from the Apple menu and make sure the computer is now
working correctly.
No: Continue to next step.
4. Make sure the machine is powered off; power off the machine by holding in the Power Button on the rear of the machine. Turn on the machine. Observe the white LED on the front bezel during startup; it should go out after a few moments. Did the LED go off?
Yes: If the LED went off, this indicates that the main logic board has communicated with the LCD display for video signal and your main logic board should be good. You can confirm by connecting an external monitor and checking to see that you have video out. Go to Step 7.
No: Continue with the next step to reset system power management (SMC).
5. Follow instructions in the “General Information” chapter to reset the SMC. Does the computer display video after successfully resetting the SMC?
Yes: Press and hold the power button until the computer powers off. Start the computer again and confirm that front LED is reliably going off. If the computer still has no video but the LED is reliably going off, continue with step 7.
No: Go to the next step.
6. Unplug the iMac and remove the SDRAM. Replace with known good SDRAM. Plug the iMac back in and power the unit on. Does the front LED go off after a few moments now?
Yes: Replace the original SDRAM and test again. If the front LED does not go off with the only the original SDRAM installed, replace the SDRAM. If the LED is now reliably going off after a few moments, but yet you still do not have any video, go to step 7.
No: If the LED remained on, the main logic board is not communicating with the LCD panel to generate video. Replace the main logic board.
7. With the LED going off, you may have a No Backlight condition or an LCD failure. In a dim room, turn the display at an angle to you and look closely at the display. Is the display completely black or can you see a dim, purplish light or glow to the display?
- Completely black: Replace the inverter
- Dim purplish light or glow: Replace the LCD panel.

Let us know what you find out.

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I'm Not Sure About The SDRAM Thingy But I'm Not Sure About A Dim Room In My House Because Some Of The Outlets Are Weak And Chances Are...

A Dim Room In My House Would Have Weak Outlets And I Don't Want To Get An Extension Cord Since I'm Moving Out Of My House And It Would Be A BIG Mess And I Probably Should Try Doing It At Night, But Wait A Minute... What Is An Inverter??? And How Do You Replace It?!


@kimbelkeener the Dim room means that you need to check that in a room that is dimmed on purpose. like a dark room to check if you can see things when you shine the light against the screen. You can keep it where it is and then just wait till the sun sets and it gets dark. Try then. There is no rush. No worries about your household current .

An inverter is a part inside that computer which supplies the power to your backlight. Based on the age of your computer and its symptoms, my suspicion is that this is a backlight issue. That is why i bolded that in my answer :-)


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Kimbel Keener wird auf ewig dankbar sein.

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