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  1. #1
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    Default Cant adjust screen brightness whilst on mains supply

    Hi everyone, I have a Dell Inspiron 1720 with Windows 7 and have the following problem. I always use my laptop plugged into the mains as the battery effectively died a couple of years ago. Now for some reason I can no longer change the screen brightness (it stays fairly dim), i`d usually just use Fn and up/down arrows. However when I pull the power cord out so the laptop is running on whats left of the battery (it will last about 15mins) I can adjust the brightness as usual and it lights up fine. Then put the power cord in and straight away it dims and cant be adjusted. Weird huh?
    I`ve tried all the settings via the control panel and right clicking to use the personalise settings and power managment etc and nothing works. I thought maybe my power adapter/charger was faulty and not putting out enough juice to illuminate the screen so I tried another one but it made know difference. Removing the battery also made no difference.
    Any thoughts? It would be a massive help if someone knew how to cure this problem.
    Many thanks.

  2. #2
    Member Spyware Fighter zep516's Avatar
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    Hi

    Welcome to Help2Go

    I'm not sure what the issue could be, looks like other users have had similar problems so a few links below that I discovered maybe worth a look for you.

    Dell Inspiron 1720 odd issue (Symptom/Solution) Vista - Computer Hardware Help | DSLReports Forums

    Display of Inspiron 1420 deems when I remove external power - Laptop Video Forum - Laptop - Dell Community

    Joe

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  4. #3
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    Thank you so much Joe!! The second link gave me the answer. I had to change the video setting in the BIOS. Pressing the F2 key along with the "power on" key during start up took me to a blue screen that I never knew exsisted!! And from there was options to adjust the brightness in the video section.
    Thanks for taking the time to reply, you`ve saved me the hasstle and expense of taking my laptop to a computer repair place.

  5. #4
    Member Spyware Fighter zep516's Avatar
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    From all of us @ the Help2Go Team!

    You're Welcome mrpercy

    Joe