Screen goes to zero Brightness

Every time I reboot, my screen automatically goes to zero brightness. I have been having issues with the computer not responding (which I've yet to resolve) but this problem just started happening. Could the two be related? I have an ibook G4 2004 14" screen 256mb 40 g
Any help is much appreciated.
D

Hi Exdj99,
Welcome to Apple Discussions
Yes, they could be related, but it's hard to say at the moment. Can you get the screen to lighten up? How do you know the brightness goes to zero instead of the screen not turning on? Can you see the outline of the images on the display? When does your computer not respond? Do you try to start it on the battery, power cord, or both?
You may want to look at/try...
Knowledge Base Document #300552 on My computer won't turn on (Display troubleshooting
Knowledge Base Document #106214 on Troubleshooting Startup Issues
Knowledge Base Document #14449, which covers Resetting Powerbook and iBook Power Management Unit (PMU)
Jon
Macbook 2.0 White (100Gb HD 2Gb RAM) Mac Mini 1.42Ghz, iPod (All), Airport (Graphite & Express), G4 1.33Ghz iBook, G4 iMac 1Ghz, G3 500Mhz, iBook iMac 233Mhz, eMate, Power Mac 5400 LC, PowerBook 540c, Macintosh 128K, Apple //e, Apple //, and some more... Mac OS X (10.4.5) Moto Razr, iLife '06, SmartDisk 160Gb, Apple BT Mouse, Sight..

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Laptop screen going dim to bright

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Try using System Restore to restore to the most recent restore point from before this began.
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SMC and PRAM reset
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System Preferences > Displays.
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It seems like any time there's a picture of say, snow with a little animal running around or a bird flying in a clear and bright sky, or explosions or... white screens as backers for cars in commercials the screen goes completely black with audio playing in the background.
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It doesn't sound like there's going to be a simple fix that you could do yourself. If you haven't yet, try cycling the power by unplugging it, leaving it for a minute, and then reconnecting it.
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If that doesn't help either, your TV likely needs servicing.
- Peter

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Hey everyone in Apple world!
I figured out how to fix the flashing yellow screen problem that I've been having on my MBP! Yessssss!!!
I found this super handy website with the golden answer: http://support.apple.com/kb/HT1379
I followed the instructions on this page and here's what I did:
Resetting NVRAM / PRAM
Shut down your Mac.
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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I went through the 6 steps above twice, just to make sure I got rid of whatever stuff was holding up my bootup process. Since I did that, my MBP boots up just like normal. No flashing yellow screen anymore!!
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Let me know if this works for you!
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Screen goes from dim to bright? WHY?

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Hiya HOR,
no problem. The only thing you could perhaps try is (in system preferences/ displays) to adjust the brightness settings and see if that makes a difference.
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Sounds like a power issue.
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Hi Emma,
Thank you for using Apple Support Communities.
I understand that your Thunderbolt display is just showing a black screen when you boot your computer. The following article should be of help in troubleshooting your display.
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Hi!
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Message was edited by: Gwenj

Try resetting Parameter RAM and see if that fixes it.
http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html

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Screen Goes Blank, Hard Drive Stuck, Cannot Re-Install, or recover

I have somewhat a bizzar problem that even with several years of IT experience I seam not to be able to figure it out. I thought I toss it our here at Toshiba community in hopes of people's collective experience shedding some lights on my problem.
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Please include your full model number when posting problems on the forums. It can be found on the bottom of your laptop. "A305D" is only partial.
That's quite the problem. How often was it doing this? At some steps in your diagnosing, it seemed to get better, but I wonder if it was actually (temporarily) fixed, or if it didn't occur by chance.
Unfortunately I don't have an answer for you. Normally I'd suggest you get it serviced, but then you'd also be throwing more money at a three year old notebook when clearly you're knowledgeable yourself.
Hopefully someone in the community will have some suggestions. I have noticed that some people shy away from posts with large paragraphs of text. (I'm not saying that's correct, but it happens.) I'd suggest putting some bullet points at the top summarizing. If you feel like doing that, you can edit your message.
Good luck!
- Peter

My MacBookPro (mid 2012) will not complete the boot process. Yosemite's progress widget gets about 1/3 to 1/2 way across when the logo disappears and the screen goes all white for 10-15 secs or so, then the machine shuts down and restarts.

My MacBookPro (mid 2012) will not complete the boot process. Yosemite's progress widget gets about 1/3 to 1/2 way across when the logo disappears and the screen goes all white for 10-15 secs, then the machine shuts down and restarts. This sequence will repeat seemingly forever unless I shut it down manually.
I upgraded to Yosemite from Mountain Lion a couple months ago, skipping Maverick completely, and I've done any associated updates that Apple told me about. I don't recall which version of Yosemite I have, but I'm sure it is the "latest and greatest".
I've tried re-starting in Safe Mode / Safe Boot and that does the same thing as described above except without the endless restarts. Instead of restarting at some point, SafeBoot proceeds to the white screen and then it hangs until I restart it manually. (I've waited as long os 20-30 minutes with no response).
When I tried the option-command-p-r key combo I never get any chimes or other noises besides the original 1 time boot sound that you would expect to get when starting up a macbook pro.
I was using the mac quite normally (meaning I was doing work I normally do on it and there was no indication of anything wrong) immediately prior to this happening.
The machine is BootCamp(ed) with Windows 8.1 which I use from a VMWare virtual machine instead of natively so that I can have both OSes running at the same time. I also think this is unrelated to my problem. I have been using this setup for more than 2 years.
My upgrade to Yosemite was uneventful and I thought it went well and was very smooth. I don't want to lead attention away from Yosemite, but at this point my problem does not seem related to the upgrade.
Any help is appreciated.

Install or Reinstall OS X from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
      the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
           because it is three times faster than wireless.

Imac 27" Intel Core 7 CPU. Screen goes black and will not respond except with a push of power button. Second monitor connected via displayport continues to display fine. Apply Store did full hardware scan and all is fine. Did clean wipe from Mavrick back

Imac 27" Intel Core7 CPU 16 Gig RAM. Screen goes black and will not respond except with a push of power button. Second monitor connected via displayport continues to display fine. Apply Store did full hardware diagnostic and all is fine. Did clean wipe from Mavrick back to Mountain Lion but problem remains. Apple Store can do no more.

I did some more digging, it appears to be a backlight problem only. I can see the screen very dimly if I use a bright flashlight in a very dark room. It also seems to run ok if the brightness is turned down a LOT.
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Help! screen goes dim, just the editing window

Hi there, I am running photoshop cs4 extended on windows 7 on hp. once in a while my screen goes dim making editing difficult. My monitor is profiled and is fine. the only thing dim is the images on my first screen. I run two screens, when I pull PS over to my other monitor it brightens up. So Its not in my file, and it isn't affecting photoshops menu bars or anything like that, and its only intermitent. the first screen is the profiled one as it is much higher quality, the second screeen is only for tools and web browsing. In have checked a lot of things and have no idea what causes this or any solution, any advice would be great.

Cannot possibly be, as for one it is a desktop computer that has no power management, and two the menu bars, tools and everything else stays the same brightness, it is only the editing window itself.
Thank you for trying, it is appreciated.

Screen goes to zero Brightness

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