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iMac G5 screen dimming, again

Message #1 - Posted 2005/03/07 - Lorenzo Thurman

I posted here a while ago about my screen alwasy starting up dimmed to the max. I thought it was fixed after I did the 10.3.8 upgrade, butala, after two successful reboots, the problem has returned and nothing seems to have ant affect. I've zapped PRAM and thrown out prefs to no avail. For the record, I believe there was a problem with half the screen dimming, but this is different in that the entire screen dims evenly and it can be resolved by resetting things in the System Prefs. I know othere have this problem, its all over the Apple Support pages, but no one seems to have an answer. Anyone knwo anything about this?

Message #2 - Posted 2005/03/07 - njbok

Anyone know anything about this?

No, but I have noticed it on mine as well. It brightens up by itself after a few minutes, though. A minor annoyance, but it does make one wonder, huh?

Message #3 - Posted 2005/03/07 - matt neuburg

Lorenzo Thurman wrote:

I posted here a while ago about my screen alwasy starting up dimmed to the max. I thought it was fixed after I did the 10.3.8 upgrade, butala, after two successful reboots, the problem has returned and nothing seems to have ant affect. I've zapped PRAM and thrown out prefs to no avail. For the record, I believe there was a problem with half the screen dimming, but this is different in that the entire screen dims evenly and it can be resolved by resetting things in the System Prefs. I know othere have this problem, its all over the Apple Support pages, but no one seems to have an answer. Anyone knwo anything about this?

The only other suggestion I have is to go inside it and zap the SMU.

<http://docs.info.apple.com/article.html?artnum=300908>

This is what solved the top-half dimming problem for me. I realize it might not be the same problem but it's worth a go. m.

matt neuburg, phd = matt@tidbits.com, http://www.tidbits.com/matt/ AppleScript: The Definitive Guide
http://www.amazon.com/exec/obidos/ASIN/0596005571/somethingsbymatt Read TidBITS! It's free and smart. http://www.tidbits.com

Message #4 - Posted 2005/03/08 - Lorenzo Thurman

Previously, matt neuburg wrote:

Lorenzo Thurman wrote:

I posted here a while ago about my screen alwasy starting up dimmed to the max. I thought it was fixed after I did the 10.3.8 upgrade, butala, after two successful reboots, the problem has returned and nothing seems to have ant affect. I've zapped PRAM and thrown out prefs to no avail. For the record, I believe there was a problem with half the screen dimming, but this is different in that the entire screen dims evenly and it can be resolved by resetting things in the System Prefs. I know othere have this problem, its all over the Apple Support pages, but no one seems to have an answer. Anyone knwo anything about this?

The only other suggestion I have is to go inside it and zap the SMU.

<http://docs.info.apple.com/article.html?artnum=300908>

This is what solved the top-half dimming problem for me. I realize it might not be the same problem but it's worth a go. m.

I got another reply from the Apple support pages, where a user suggests it might be a custom profile. I'll try it at home when I get there and see if makes a difference. How do I zap the SMU, I don't know about this one.

Message #5 - Posted 2005/03/08 - geech

"Lorenzo Thurman" <lorenzo@nospamthethurmans.com> wrote in message news:lorenzo-831BC2.10204308032005@sage.thethurmans.com...

I got another reply from the Apple support pages, where a user suggests it might be a custom profile. I'll try it at home when I get there and see if makes a difference. How do I zap the SMU, I don't know about this one.

If you click on the link he posted, you will find out how to reset the SMU. Funny how that works out.

Message #6 - Posted 2005/03/08 - Lorenzo Thurman

Previously, geech wrote:

"Lorenzo Thurman" <lorenzo@nospamthethurmans.com> wrote in message news:lorenzo-831BC2.10204308032005@sage.thethurmans.com...

I got another reply from the Apple support pages, where a user suggests it might be a custom profile. I'll try it at home when I get there and see if makes a difference. How do I zap the SMU, I don't know about this one.

If you click on the link he posted, you will find out how to reset the SMU. Funny how that works out.

DUH

Message #7 - Posted 2005/03/10 - Lorenzo Thurman

Previously, Lorenzo Thurman wrote:

Previously, geech wrote:

"Lorenzo Thurman" <lorenzo@nospamthethurmans.com> wrote in message news:lorenzo-831BC2.10204308032005@sage.thethurmans.com...

I got another reply from the Apple support pages, where a user suggests it might be a custom profile. I'll try it at home when I get there and see if makes a difference. How do I zap the SMU, I don't know about this one.

If you click on the link he posted, you will find out how to reset the SMU. Funny how that works out.

DUH

So, I'm trying the simple thing first. I got a suggestion that the custom monitor profile might be the problem. So, I reset my iMac to the default "iMac" profile last night. This morning, it started up OK, with the brightness setting intact. I'll power it up again this evening and see what happens. I'm not averse to opening the box up, but if this fails I'll try resetting the SMU.

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