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I can't find any place where I can control screen brightness.

I did not supply a product key during Windows setup if that matters.

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Have you installed the OS? or is the screen going bad? Connect an external monitor if the screen might be bad. More info needed... –  Logman Nov 3 '12 at 12:57
    
OS working fine. But some of the features are disabled. –  suresh.g Nov 3 '12 at 13:00
    
are you logged on as an admin/power user? UAC window popping up? –  Logman Nov 3 '12 at 13:01
    
i login as admin. –  suresh.g Nov 3 '12 at 13:02
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3 Answers

up vote 3 down vote accepted

Control Panel\All Control Panel Items\Power Options

enter image description here

you do not have this option? Or are you talking about a hot key? (f2/f3 etc?)

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yes i accept. but i dont have this options in my windows 7. what is the problem? i unable to understand. –  suresh.g Nov 3 '12 at 12:59
    
I installed display driver. Problems solved. –  suresh.g Mar 28 '13 at 5:50
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That option is missing because after reinstalling windows you didn't reinstall the drivers for your display adapter.

If you're uncertain where to find your driver, post the make and model of your system and someone here I'm sure can post a link to where to download it.

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Use this Free Softwarehere to change you brightness and do lot more things using Command Prompt.

  1. Download it and Copy it C: drive.
  2. Open command prompt as Admin.
  3. Type cd C:/nircmd
  4. Then nircmd.exe setbrightness 50

That value can be from 0 to 100. Check out it documentation for more commands.Enjoy.

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I'd be curious if this works with the default display driver he appears to be using. –  Snesticle Nov 3 '12 at 14:52
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