View Full Version : iMac with funny screen

7th February 2004, 11:27 AM
Hey guys,

Have another friend with a 366 G3 iMac. The screen colours are going funny and the icons are getting a green highlight around them. On top of that, text menus and names under icons are rather fuzzy - blurred. Any ideas on what the problem is?


7th February 2004, 11:34 AM
... just moving this to the 'help' section. :)

7th February 2004, 12:22 PM
To me it sounds like video corruption somehow... either dodgy video RAM or dodgy display drivers.

Have you reset the PRAM?

Try reinstalling the os, see if that makes a difference.

7th February 2004, 05:30 PM
If reinstalling the OS doesn't help, then the analog board's probably gone. Damn Steve and his group of idiots for not putting a fan in the slot load iMacs! :angry:

9th February 2004, 12:23 PM
Maybe the monitor is giving you some curry. Time to repair or replace it.

Maybe one of the colours are not firing.


9th February 2004, 09:12 PM
Does it look like the colours aren't merging all together correctly, rather like old printed cartoons where the colours didn't overlap quite right?

Sounds like the monitor is flaking out...maybe see what settings you can play around with in the Display control panel/system pref-pane.

10th February 2004, 06:53 AM
Green fuzz round edges might just be misaligned video circuitry or even just as simple as tube magnetisation (which possibly means failing circuitry, but...) Rule one: DON'T put speakers and other large magnets near CRT displays :)

To demagnetise you need a degausser, to relign colour scanning, you need even more specialised gear. Any good (non-apple) service tech should be able to fix this cheaply and quickly.

EDIT: A TV/Monitor techo friend reckons that if iMacs have built-in screen degaussing, that may have failed.

10th February 2004, 07:05 AM
Don't put any magnets near the computer at all.

Use to work at Strathfield Car Radios and occassionally would put large subwoofers meters away from computers to ring up a sale.

You'd get to the screen to enter the data and print an invoice. The display was warped. The actual image on the screen was bending from a magnet 2 meters away from it.

Once, someone who did not know about such thing that worked there left a speaker right next to the computer, then continued to whinge about the computer not working.....hmmm

I wonder what happend?

The HDD was wipped, the monitor was actually screwed for good and we had to spend the rest of the day writing invoices my hand...don't mind so much but it just took longer.

Moral of the story.....don't put speakers next to computers, unless they are advertised as magnetically shielded. But even then, cheapos are something to look out for.


kim jong il
24th February 2004, 05:12 PM
SERIOUSLY, try this: go to the apple site and download the current imac firmware update (available from apple support? I'm pretty sure. anyhow google it and all will be good) (currently 4.1.9 from memory). DO IT and your problems may be over. OS X 10.0 and others? were notorious (EDIT 3: not actually notorious. it is a little known problem that even apple techs seem , in some cases, to be unaware of) for corrupting firmware. Yes FIRMWARE. No amount of PRAM zapping can influence this. Later installers asked if you had performed this action, earlier ones did not. Even if this is not the current OS, if it was attempted in the past it may be the problem.

EDIT: I forgot to mention you have to run the updater :blink:

EDIT 2: As a rule for everyone. You cannot go astray running the firmware updater. If it does not need to be done the installer will tell you and quit. If it does just follow the instructions it is a very quick (2 mins?) process that involves a restart. As with all firmware updates do not interrupt the power supply or press the reset button during this process

cheers, kim

EDIT 4 did anyone actually read this or make use of the tip?