IMac 15in flat screen appears darker or dimmer than ever before

In the last week, I have sensed a noticeable difference in my iMac flat screen brightness. It is as though my eyes are getting older, and the screen itself is dimming. While the former might be true, the flat screen is obviously experiencing something I cannot understand or fix. Any ideas?
iMac G4 15in flat screen Mac OS X (10.4.4)

Bronco,Have you double checked your display settings? (Apple Menu > System Preferences > Display > Bightness slider).
It's possible a (backlight etc) on it's way...
mrtotes
Sorry, just realised I've completly duplicated previous efforts. cheers karl!

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Which Airport card do I need for an iMac G4 Flat Screen 15"?

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Choose About this Mac from the Apple menu and click on More Info, or if you're running Mac OS 9, choose Apple System Profiler from the Apple menu. Check the speed of the computer's CPU; if it is below 1GHz, you need the regular AirPort card, with the AirPort Extreme card being used on newer iMacs. No iMac G4 requires an adaptor to use an AirPort card.
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IMac 17" Flat screen - display remains black

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Hi All,
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Welcome to Discussions Nate - what you are having are called Kernel Panics and here is a link to Dr Smoke's Resolving Kernel Panics which should give you some help. If his suggestions don't work, you will have to take your computer in for repairs.
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Hi Dr.Yoda69,
Thanks for visiting Apple Support Communities.
If your Mac only starts up to a gray screen, I recommend trying these steps next:
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Note: "Peripheral devices" refers to external devices other than what came with your Mac, such as hard drives, printers, or hubs that you connect via a USB or FireWire cable.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Disconnect all peripheral devices such as external hard drives or printers (leave only the display, a keyboard, and mouse connected).
Disconnect any Ethernet cables.
Start up your Mac.
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Note: If you have multiple peripheral devices and the issue only occurs when they are all connected, but not when each device is the only peripheral connected, see the Additional Information section below.
If you are using a desktop Mac with a third-party keyboard and/or mouse device, and the issue still occurs, try starting up with an Apple keyboard and mouse connected instead. Try starting with no keyboard and mouse connected, then connect them after start up. Also, try a different USB port on your Mac.
If the gray screen issue persists with no devices connected, go to the next section (with the peripherals still disconnected).
Perform a Safe Boot
Simply performing a Safe Boot may resolve this issue.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Start your Mac, then immediately hold the Shift key. This performs a Safe Boot. Advanced tip: If you want to see the status of a Safe Boot as it progresses, you can hold Shift-Command-V during start up (instead of just Shift).
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If your Mac starts up as expected, immediately try restarting.
If the Safe Boot does not work, or the restart after a successful Safe Boot does not work, go to the next section.
Reset the NVRAM / PRAM
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Reset the NVRAM / PRAM.
If the gray screen issue persists, go to the next section.
You can find this information and additional troubleshooting sections here:
Mac OS X: Gray screen appears during startup - Apple Support
All the best,
Jeremy

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Hi john83... Provided you are referring to an iMac and not a MacBook, you should post your question in the iMac forum:
https://discussions.apple.com/community/desktop_computers/imac_intel?view=overvi ew

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Yes.

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I have a new MacBook Pro and have given my iMac G4 Flatscreen to my wife for her personal use. I was the Original Administrator on the machine and she was a user. She is now also an Administrator and I wan't to delete all reference to my account and leave her as the only Administrator and with a clean hardrive without all my stuff clogging it up. How do I do that?

Log in from an administrator account other than the one you want to delete, and then use the Accounts pane of System Preferences to delete the unwanted account. Next, open the Users folder on the hard disk and look for a folder named Deleted Users; if you find it, delete everything inside which relates to the old account.
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Thanks for the prompt. I discovered (didn't know it existed) the brightness selection under system preferences and found it to be at its lowest point. I merely slid it to the right, and all has improved. What a simple, but helpful suggestion. Thanks.

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I posted on this board a few days ago about installing tiger on my 17” imac G4 800 mhz Flat Panel.
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imac G4 flat 17" screen Mac OS X (10.2.x) 800 mhz

Can't you borrow a friend's external drive ?
You could use mine but I live a bit far away (10 hours flight)... unfortunately for you ...
If you have important data on your drive you should anyway consider such an external hard drive for easy, safe and fast backup ! Prices droped significantly and a low capacity (120 gig) external firewire drive shouldn't cost over $100.-- (unlike a computer, they easely fit in a safe when you are away for a long period...)
You could ask someone (reliable) or Apple centre to change the internal drive by remplacing it with a new faster one. This way you may put the old drive in an empty (you should buy an external drive case, I suggest a sarotech FW/USB II and a maxtor drive) case you could use as backup drive.
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coolapic
Mac OS X (10.4.3)
Mac OS X (10.4.3)

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My imac flat panel screen is dark, tried hooking up exterior monitor with proper adapter and exterior monitor says in power save mode press any key or move mouse but still no picture?

Sounds ominous. When an external display fails to show up anything, that usually indicates that the video hardware on the logic board has failed. Were ony the display or its cabling at fault but the logic board hardware was working, the external should still show something.

What do ido if My iMac (intel) starts but the screen remains dark.

What do ido if My iMac (intel) starts but the screen remains dark.

Reset the SMC > Intel-based Macs: Resetting the System Management Controller (SMC)
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Reset the PRAM > Resetting your Mac's PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
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Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Try booting into Safe Mode > Mac OS X: Starting up in Safe Mode
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
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IMac G4 screen remains dark

my 17' G4 iMac USB 2.0 (10.4.11) screen froze and the following messages appeared:
"System failure: cpu 0 00000008 unaligned stack"
as well as lots of the following lines:
"Unresolved kernel trap (cpu 0) 0x600 Alignment DAR" etc
Had to shut it down by using power switch. Pulled out all cables except for mouse + keyboard.
I can start it - but there is no start-up chime and screen remains black.
Tried safe boot, no response. Tried to open drive door during start up for putting in hardware test disc (mouse held down), door won't open.
Tried PRAM, no response. Tried PMU reset, no change.
Removed extra RAM I had fitted years ago and tried to start it. After I did that the iMac responds
with a 4 x beep morse code signal after turning it back on, but screen remains dark.
Also tried to start in target mode, but other 27' iMac does not "see" G4 iMac.
Anyone has any thoughts ? Don't want to get rid of this machine, I love the design.
Thanks
Walter

There is some likelihood of a hardware failure, to include
perhaps, the logic board; some kernel panic issues on an
iMac G4 could point to such an event.
Not certain if checking out such a machine at that stage is
possible with the original Apple Hardware Test, since that
relies on viewing evidence of the results in said computer.
• What do the beeps mean on startup?
http://www.welovemacs.com/whdoallthbme.html
{After Oct 1999 the four-beeps signal appears to mean a
different symptom, according to the above page...} *4 beeps =*
*no good boot images in the boot ROM (and/or bad sys config block)*
• *Power On Self-Test Beep Definition* - Part 2:
http://support.apple.com/kb/HT1547
• Technical Note TN2063: Understanding and Debugging Kernel Panics
http://developer.apple.com/mac/library/technotes/tn2002/tn2063.html
• Resolving Kernel Panics:
http://www.thexlab.com/faqs/kernelpanics.html
While it may not be a major melt-down, you could be in for
a project at some point in the future if you start looking into
finding other similar iMac G4s (they are getting scarce) to
use either for parts or as spares should their needs go there.
I have two running iMac G4 1.25GHz 17" & one in-op for parts.
A skilled and willing computer shop tech could probably
test the computer further, but some shops would rather
you buy something newer from their retail store. In some
cases, you may be able to get a working iMac G4 17" 1.25
for a few hundred dollars; if lucky, one in fine shape.
Perhaps one of the techie folks who frequent these forums will
see your post & offer their insights, based on experience.
Good luck & happy computing!

Having problems connecting iMac(late 2006) running 10.7.5 to a Samsung Flat Screen TV using separate audio/speaker cable and HDMI standard cable, mini-DVI to HDMI video converter. TV displays generic Apple galaxy background and "some" windows (e.g. scree

Not sure that I have selected the correct forum. Hope my questions are clearly stated.
Having problems connecting iMac(late 2006) running 10.7.5 to a Samsung Flat Screen TV using separate audio/speaker cable and HDMI standard cable, mini-DVI to HDMI video converter. TV displays generic Apple galaxy background and "some" windows (e.g. screen resolution choices). It does not show Mail or Safari menus. System preferences' display "gathered" the Samsung and chose its resolution. I did not find a way to select the Samsung as my display.
In addition to having old hardware, we have Verizon FIOS providing internet and TV access. Is there any way to make this work for us? We would like to stream video (Netflix) and view shows from the Web. Do we need Apple TV to do this? Or is it not possible with our old iMac? My husband thinks that our Airport could be a factor.
Thank you

Lately, I have been seeing a lot of posts with users trying to use their Macs/iMacs to mirror their streaming video from their Macs to an HDTV.
There are, actually, many alternatives to choose from than just from a Mac.
You need to have or invest in a WiFi capable router for all of these examples.
Apple TV only integrates with WiFi and newer Mac hardware. So, if you want to have total integrated experience, if you have a 2011 Mac or newer, you might as well pay the $100 for the AppleTV box.
If you have a older Mac, like I have noticed many users do, then you have other options.
If you want to elimate long cable clutter and having your Mac at the mercy of your TV all of the time, you can still use the AppleTV box independently or purchase cheaper alternative media streaming boxes from Roku, Sony, Boxee or any number of electronics manufacturers that now have media streaming boxes and media streaming capability built into DVD/Blu-ray players.
These eliminate long cable clutter by being close to the HDTV where shorter, less expensive cables can be used.
Another alternative for iPad users is to use an iPad with the USB/HDMI video adapter and use your iPad as the streaming box. This ties up your iPad in much the same way as it does with your Mac, but again the iPad can be close to the TV and use minimal cables to the TV.
Another alternative to is to use a combination of an iPad and your Mac to stream content that is only available to stream online from a computer. In this case, you can use a desktop remote app on your iPad and Mac. A good and cheap Desktop Remote app is Splashtop Remote. This allows you to completely connect your iPad remotely, over Wifi, to your iMac desktop. The app streams both video and sound to the iPad which is still connected to your HDTV. The resultant stream video picture will be smaller than the size of your HDTV, but it will still be plenty large enough to watch. Again, if you own a iPad and an Intel Mac, this method also allows minimal cabling to the TV.

IMac 15in flat screen appears darker or dimmer than ever before

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