23" cinema display

Question

Level 1

16 points

23" cinema display

I have an Apple 23"cinema display with an older G5 (Mac Processor). When the computer is booted, the display will not work. I have to unplug the power block and reconnect it up to a dozen times before the display will appear.

So ... I bought another 23" display - thinking it was either the monitor or the power block. This does the same thing as the original When the G5 is powered-up, the monitor will not power-up.

It appears that the Mac is not recognizing either 23" display. To be clear, for years, it was fine. All of a sudden, it stopped recognizing the display. Any ideas on what gives?

Mac G5 Tower / Mac G4 Laptop, Mac OS X (10.4.10), None

Posted on Sep 14, 2013 5:13 AM

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Answer 1

BDAqua

Level 10

239,135 points

Sep 14, 2013 11:30 AM in response to bcoine

Hi, is it the Plastic ADC model or the Aluminum DVI model?

Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...

See which one your G5 has...

http://eshop.macsales.com/item/Newer%20Technology/CR2032/

http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/

Have you done a PRAM reset, CMD+Option+p+r...

http://support.apple.com/kb/HT1379

In fact, do 3 in a row, takes a bit of time.

How to reset the SMU/PMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...

http://support.apple.com/kb/HT1436

Earlier G3, G4, G5 models...

http://support.apple.com/kb/HT1939

http://www.macusersguide.com/2009/05/resetting-pram-nvram-pmu/

Also, have you blown the dust out lately? Especially the Video card, maybe even reseat the Video card?

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Answer 2

bcoine Author

Level 1

16 points

Sep 15, 2013 7:54 AM in response to BDAqua

It's the aluminum/metal model - not plastic.

It does it with the old monitor (and power supply) and the new monitor and power supply.

I will try the PRAM.

Thanks for the suggestion.

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Answer 3

bcoine Author

Level 1

16 points

Oct 5, 2013 9:24 AM in response to bcoine

Well, this is really strange.

I zapped the PRam, and that seemed to fix the problem.

The monitor worked for a couple of weeks.

Now, it's back to not coming on when the computer boots.

Any more suggestions?

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Answer 4

BDAqua

Level 10

239,135 points

Oct 5, 2013 11:08 AM in response to bcoine

I wonder if the LCD or backlight has given out, on the Mac, once booted, hold a Flashlight up close at an angle & move it around, do you see a faint desktop?

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