IMac :: Screen Set On Full Brightness On Every Startup
Sep 9, 2009
I have a Rev A (Aug 2007) alum iMac (20") and ever since I installed 10.5.8, the screen has been set on full brightness on every startup. I'm currently running Snow Leopard and the problem persists. I erased and installed during the procedure so I don't think it can really be a corrupted system file or something.
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Jan 20, 2010
When I have my brightness at a certain setting and then start playing a game, the brightness jumps to full. When I then press the button for less brightness, it jumps immediately to the setting it was originally.
This also happens whenever I do alt+tab to return to the desktop. So it appears it happens when I do something that requires to switch to full screen mode cause it also happens with other programs.
At normal use, surfing, office,... this problem does not occur. And also it doesn't happen under OS X
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Mar 4, 2008
My MacBook's screen is pretty dim, even at full brightness. The iPod Touch far outshines it and even a Sony PSP is brighter.
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Nov 28, 2010
I have the 21" iMac and need to brighten the screen. How do I do this?
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Mar 4, 2007
I just purchased a Mac Mini and am using a DVI to HDMI cable to connect it to my 42" Sony KDF-E42A10. I am unable to achieve full-screen resolution and downloaded SwitchResX to manually adjust the display. Does anyone know the timing parameters for the Sony or how to achieve full-screen resoltuion?
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Jun 20, 2009
So I installed Vista 64 bit on my Macbook Pro (Santa Rosa), I installed most of the drivers I can find, but I cant get the screen brightness buttons to work (F1 and F2)
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Feb 17, 2008
I have dual ACD's. How do I make it so that both screens have the same brightness? If I adjust the brightness in the display settings it adjusts the main screen, but then not the other one. How do I make them the same?
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Aug 7, 2009
Am I the only one having this bug? I have a 2009 24" iMac Radeon 4850 and after installing the 10.5.8 combo every time the machine boots the brightness is set to maximum.
I tried zapping the PRAM and that didn't help.
The other problem I noticed is that my startup network shares, even though checked to "hide" pop up finder windows at boot time. It never did this before (even without hide being checked).
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Apr 12, 2012
my start up disc is full and when i switch on my computer the screen is blank. how can i get the dock up again
Info:
MacBook Air, Mac OS X (10.6.8)
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Aug 25, 2009
After every reboot, the brightness of my iMac's screen changes to 100% brightness, which is slightly annoying. Does anyone know why this happens? By the way, I'd say it does it since 10.5.8.
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Nov 15, 2010
The brightness goes up when you plug in your MBA, but then over time it just goes up and up. I honestly like my brightness pretty low (rarely more than half, typically at 3-5 notches), but it just keeps on going up and up. I almost never set it above half, but multiple times a day, I notice that it looks pretty high and it's at like 3/4 so I put it it down to about 1/3, but after a while, it's just up again.
Anyone else notice this? What is it, why does it do this? How can I fix it? I don't mind not having auto-brightness (even though I loved it), as long as my screen doesn't keep going up.
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Jul 23, 2010
All of a sudden, every time I reboot, my screen's brightness is all the way up. So, I go to 'Preferences' and bring it down to only happen again the next time I reboot. Not a terrible problem, I hope, but not sure why the settings of this doesn't remain as I left it last. Perhaps I have picked up something OR I have a fault which could get worse?Anyone seen anything like this?
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Sep 10, 2014
How to keep the Brightness meter icon from appearing on your screen?
Model Name: iMac Model Identifier: iMac12,2 Processor Name: Intel Core i5 Processor Speed: 3.1 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 6 MB Memory: 16 GB Boot ROM Version: IM121.0047.B1F SMC Version (system): 1.72f2 iMac (27-inch Mid 2011), OS X Mavericks (10.9.4)
Info:
iMac (27-inch Mid 2011), OS X Mavericks (10.9.4)
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Aug 26, 2010
I just want to let you know that I am really thankful for your help.
This is a 3-year old iMac version 10.4.11
I upgraded Safari as recommended a few days ago, and since then, Safari has not worked at all. At the same time, I was warned that my startup disk was full. Following the advice from some other mac help sites, I cleared the copies of my iTunes library to free space. I now have 6.72 Gigs of free space on my hard drive, but my computer is still running super slow. Just about every other thing I click on in Firefox gives me the rainbow wheel.
I ran Techtools and everything passed but the Directory Scan and Volume Structure.
As soon as a friend can loan me a hard drive, I was planning on backing up everything and re-installing. Is this the best thing to do, or is there something else to try first?
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Aug 3, 2009
I have mine on one bar and I am finding this okay. Full brightness practically burns my eyes. Where do you have your brightness set to?
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May 17, 2009
My friends alu intel imac is having a problem. When he power on the machine the computer gets stuck on a blue screen.
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Nov 21, 2009
A friend passed on some games to me, all are fine except Need for Speed Most Wanted - I cannot get it into full screen mode.
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Feb 14, 2012
how do I get Safari back to full screen ...not sure what I did but it is only at 1/2 screen size.
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Apr 5, 2007
My brother's iBook G4 (I think it's a 2003 model) has a problem with the screen. When the computer is turned on, the screen stays black, although the backlight is on (the apple glows). Sometimes, on start up, the screen works normally for a random amount of time before going fuzzy and then black again.
Any ideas on how to fix this? Is it likely to be a problem with the hardware in the actual computer, or just the screen? Or is it a software thing?
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Mar 27, 2010
i have a brand new imac and i am having some problems on a few web sites, not all websites. when i try to make the video full screen it doesn't work. for example, if i go to www.theahl.com i can't make the game highlight clips play on full screen. but if I go to www.whl.ca, i don't have a problem. They both go full screen on my husband's pc.
i made sure adobe flash player was updated..
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Mar 19, 2012
I have been limping along for quite some time with a recurring problem with my PPC Flat Panel iMac G4.Sometimes when starting up I would get a black screen. The unit chimes at startup but the screen would stay black.I found that I was able to fix (temporary) the problem by removing the bottom plate and pushing the reset button under the base.(After shutting down and unplugging the unit.) after the startup chime, the screen turned gray with a folder icon in the center with a blinking question mark.After shutting down and restarting, this happened again 3 times.On the 4th shutdown/startup it went back to the black screen.Repeated shutdown/restarts have no effect.Shutting down, unplugging the unit and pushing the reset button is also having no effect.I hear the startup chime every time. Black screen every time as well now.
Info:
iMac, Mac OS X (10.4.11)
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Oct 30, 2010
I own an early 2008 iMac running Snow Leopard. A few months ago, it started getting a little buggy and running slow, you know, things you would expect from a computer that's now 2 years old. But then it started freezing and giving me "kernel panics". Of course, the first thing I did was install VirusBarrier and remove any and all viruses it could find, and I repaired the disk and disk permissions and ran all the diagnostic tests from the install DVD. Then I left it unplugged for a day, upgraded the memory from 2 GB to 4 GB and did everything a second time. After all that, everything seemed to work just fine.
Now it seems to be starting all over again! This time the virus scan only picked up a few Windows viruses on an old external hard drive and repairing the disk, disk permissions, and running diagnostics turned up nothing. I've done everything I know to do, short of taking the thing back to Apple! Right now, the main issue is this bug at startup that's really just freaking me out. Linked is a video of what happens. The apps that run at startup are BumpTop, HughesNet Status Meter (as of last month), and Brother Printer Utility. [URL]
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Jan 20, 2010
At start-up I see a blue screen for some 4-6 minutes delaying the start-up of my new (Nov-2009) iMac; I have installed the latest OS version.
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Mar 16, 2012
My screen has gone to a very dark grey on startup. I can faintly make out the desktop icons, but it is about 98% black. Everything else seems to be fuctioning. iMac G417" Flat Panel 17" [Pixar-lamp style] OS 10.4
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Aug 1, 2010
I went to Best Buy yesterday and they just got the new imacs in and had on display side by side. The 21.5 display was not as bright and vibrant as the 27 display. The apple and best buy guys could not tell me why the difference. The settings were checked and found to be the same for both machines. I was going to get the 21.5 but now not so sure. I definitely like the brighter 27 better. Is this normal? Why is the 27 brighter? Has anyone else noticed the difference?
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Jun 15, 2009
Has anyone noticed a very slight flicker on their new MBPs? I have a new 13" and, every so often, the screen brightness dims and then brightens very quickly (happens in less than a second).The option for auto-adjusting the screen brightness is off so it's not that particular function.It's most noticeable on all-white backgrounds both on AC and battery power. Hard drive access doesn't seem to coincide with the dimming.
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Jun 2, 2014
I was off of my iMac for an hour or two so my screen saver when on. I went to wake the computer and it was frozen. I tried using the keyboard and mouse to wake up the computer from the screen saver, but it would not work, so I powered the iMac down manually from the button on the back. I let it sit for 15 minutes, then I tried to start the computer up again. Now at start up, I get to a blank white screen with the spinning moving pin wheel, and that is it.
Info:
IMac 2Ghz Intel Core Duo, Mac OS X (10.5.7)
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Jan 19, 2009
lately, my mba has been behaving a little weirdly. its screen would suddenly become a little dimmer when the brightness in the room has not changed a bit. after a long while(15 min?), it'll turn brighter again by itself, and again without any change in the lighting of the room. the change is not big but obviously. any idea? can it be some software? or setting? or a defective light sensor?
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Dec 22, 2009
I have a 2007 aluminium imac running Snow Leopard. It needed to have a disk drive replacement recently under applecare. Since I got it back I have noticed a marked dimness in screen brightness starting about halfway down the screen, most noticeable against a window with a white background. It is pristine white at the top of the window but from about halfway begins to get dimmer. Its a bit like being in sunlight and the coming into shadow, or finding mist creeping into the picture.
I have tried recalibrating it but it makes no difference. It might have been there before the repair but if it was I didn't notice it or else I grew used to it but now I find it quite distracting and it does make text a little harder to read as I'm getting on in years and my sight needs all the light it can get. Is it normal or is it a sign of problems beginning to manifest themselves with the display? I wouldn't like to ignore it & find myself out of applecare cover when it does.
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Jun 1, 2008
So I have noticed a few times already, that the screen on my white macbook flickers to change the brightness level. It can do this while the computer is plugged in and charging, or if it's off the charger. It is definitely noticeable as it causes me to just watch what the screen is doing.
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