Monitor screen turning dark

My IMac monitor screen has started to darken from the bottom of the screen to about half way up to the top. Any suggestions as to what may be causing this issue?

Hi Beachgirl,
sorry to hear about your issue, considering the age of your mac and the problem as you described it, I would say the hardware, in this case the screen itself is reaching the end of its it life. You can try adjusting the brightness settings in the control power under energy saver, but if its half the screen being effected than i would assume the issue is hardware related. That being said, the cost to repair this issue will probably costs you 1/3 of a new iMac.
Good luck,
Dr.C

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Screen turns dark and freezes, when refreshing deletes written txt

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It's disturbing that you get ads just starting up the browser. Where did you download Firefox from? Unfortunately there are some unauthorized modified versions promoted in search engine results...
Some things to check:
# Home page -- [[Startup, home page and download settings]]
# Extensions (more detail below)
# Malware -- [[Troubleshoot Firefox issues caused by malware]]
# Program shortcut (more detail below)
'''''Extensions'''''
Add-ons, and particularly extensions, can override your settings in Firefox's normal dialogs. Use the Add-ons page to review and disable or remove ALL nonessential or unrecognized extensions. Either:
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* orange Firefox button (or Tools menu) > Add-ons
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How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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Hi
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Screen Turned darker and icons became pixellated. Help!

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Hey.
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Try:
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Hi there,
I used HP Pavilion dv6t-6000 CTO Quad for 3 years.
CPU: Intel core i7-2630QM
GPU: AMD Radeon 6490m
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Hi @kolz,
Welcome to the HP Forums!
It is a wonderful place to find answers and solutions!
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
i grasp that after updating your system from Windows 8 to 8.1 you are having an issue with the display going dim.
You have tried some steps you located on the web but there was no change.
Windows 8 an 8.1 are not supported Operating Systems for your notebook. This does not mean they will not work only that HP has not tested it and therefore does not supply updated drivers. You would need to check the manufacturer's site for any updated drivers.
Downloading or Updating Software and Drivers for HP Computers
When I checked the driver page for your notebook I did notice there is a bios update, have you done that?
HP Pavilion dv6t-6000 CTO Quad Edition Entertainment Drivers and Software
As a bios update does have a potential to cause damage I suggest contacting HP support for assistance with that process.
Updating the BIOS
Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
World Wide Phone Support
Good Luck!
Here is a link to Troubleshooting a dim display (Windows 8, Windows 7 and Windows Vista)
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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Duquan,
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Do you have gfxCardStatus installed? Is your monitor set to "Integrated" or "Discrete". You want it set to Discrete to drive the external HDMI display.
Try resetting the PRAM and SMC
<About NVRAM and PRAM>
<Intel-based Macs: Resetting the System Management Controller (SMC)>
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Monitor screen turning dark

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