My screen has dimmed with no explanation

Discussion in 'Windows Vista General Discussion' started by Flash 103, Aug 30, 2008.

  1. Flash 103

    Flash 103 Guest

    Hello everyone.

    Just a few days ago, my computer has been acting weird. The displa
    keeps dimming for no reason that I can see.

    I can turn on my computer, log in, and stay at the desktop for about 3
    seconds with a fine and bright display, but then it suddenly dims an
    stays that way. The only time it will un-dim is if I put my password i
    again after the screensaver comes on. It will then turn bright as i
    brings up the desktop, but that's only for about 2 seconds. Then whe
    the desktop is back up, it will dim again.

    I really do not think it has anything to do with my monitor because:
    1. It's always bright when I've mentioned, and then turns dim. It'
    like clockwork.


    However, if I do start up a program where it asks me if it ca
    continue, the screen only gets DARKER for that portion, and then turn
    back to dim when I pick an option.

    I really have no clue what could be causing this, and it's ver
    annoying. The only thing that "changed" during the time this happene
    was that I bought a new Dell laptop (my computer is made by Dell, too
    and both have Vista) and connected it to my home internet. I used tha
    for about a day, and then when I returned to my main computer, I sa
    this problem.

    It reminds me of how on my laptop I can set the battery to "power save
    and it dims the screen. It looks just like that, except for the mous
    cursor remaining bright. But I'm not sure how that can affect my mai
    computer at all. I just figured I should mention it anyways.

    Either way, thank you for your time and any help that you give me! :
    Flash 103, Aug 30, 2008
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  2. Flash 103

    Not Even Me Guest

    Is it a laptop?
    There is a power setting that will do that on a portable, usually under
    'when running on battery' power scheme.
    Not Even Me, Aug 31, 2008
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  3. Flash 103

    chinga69 Guest

    check your power and screen saver setting
    chinga69, Aug 31, 2008
  4. Flash 103

    Flash 103 Guest

    No no, it's a desktop computer. I just mentioned the laptop becaus
    that what it reminds me of. But, it's a desktop computer.

    And to the next poster down, the system and screensaver setting wer
    the first thing I checked. Apparently, I've had the computer on powe
    save mode since the first day I got it about over a year ago. I neve
    dimmed the monitor during all that time, though. I don't think that'
    the problem, but still, I've changed it to High Performance, bu
    nothing has changed.

    I still don't understand, though, why it's the whole screen that dim
    except for the mouse cursor. It's like some weird visual effect th
    computer is using
    Flash 103, Aug 31, 2008
  5. Flash 103

    chinga69 Guest

    can you try another screen just to check if its vista or your scree
    chinga69, Sep 1, 2008
  6. Flash 103

    Flash 103 Guest

    Sorry about the delayed response. I've been busy with college stuff.

    Anyway, to chinga69, I cannot try another monitor, but I do know for a
    fact that it's something wrong with Vista or some sort of hardware and
    not the monitor. I've tested it a few times and I can start up the
    computer and sit at the login screen for a long while (and probably
    forever) without any dimming. Once when I log in, it usually takes 30
    or 40 seconds for the screen to finally dim. Also, as I've mentioned,
    the mouse cursor stays bright. I've never heard of a malfunctioning
    monitor that can dim everything but one thing that I can constantly
    move. Maybe it could dim all but one area of the monitor, but that
    isn't the case...

    To Andrew Rossmann, I've updated my video driver and there is no
    change. I'm not sure how to uninstall it or where to go to install it
    again... I've check the controls on the driver (it's an ATI Catalyst,
    it says) and they all look normal, nothing has been changed and they
    all seem to be set on the high performance options instead of the
    power-saving ones, etc.

    So I'm still clueless on what is causing this. I can only guess that
    some sort of program on start up is doing this, but I don't know what,
    or how to check...
    Flash 103, Sep 6, 2008
  7. Flash 103

    Not Even Me Guest

    it almost sounds like you may have some accessibility setting (maybe high
    contrast) turned on and mal-adjusted.
    Not Even Me, Sep 7, 2008
  8. Flash 103

    Flash 103 Guest

    It might have been that... but it seems to have fixed itself somehow..
    I had the computer off for like a day or so because I just couldn't dea
    with it and this morning I turned it on to print something out reall
    quick. I didn't realize it then because I was in such a hurry to go t
    class, but the screen didn't dim.

    Now about four hours later, I come home and find the screen stil
    didn't dim. I'm relieved everything is back to normal, but I have a ba
    feeling that it may relapse. I don't understand how it could just act s
    bizarre and then suddenly stop. I wonder what the problem was.

    Hopefully I'm wrong and it stays fixed..
    Flash 103, Sep 8, 2008
  9. Flash 103

    mrawde Guest

    I just got the same problem. It started last night. I'm using vist
    home premium 32bit. I'm on a laptop and when I hook up an externa
    monitor, that screen is still bright. Only on the laptop's display do
    get the bright cursor but everything else dimmed
    mrawde, Sep 8, 2008
  10. Flash 103

    Tom100 Guest

    My display dims whenever computer is idle and no app is running on th
    screen (not minimized) because I had set the Vista display mode to Bes
    appearance. Its not the display or drivers - its the Vista settings
    Easy solution - in Control Panel's Performance, switch to "Bes
    Tom100, Nov 21, 2008
  11. Flash 103

    oddeyeball Guest

    I have this similiar problem and it seems to affect both ATI and nVidia
    chips. The way I have been able to fix it everytime was just opening
    the control panel for either card and adjusting any of the desktop color

    Seems like a glitch to where the display driver dims the screen for a
    sec whenever that UAC pops and it forgot to put it back to normal.
    oddeyeball, Dec 5, 2008
  12. Flash 103

    nawad58 Guest

    I was having this same problem with Vista Ultimate on an ATI Mobility
    Radeon HD 3400 Series.

    Here's how to fix it:

    In the catalyst control center, go to the advanced settings.

    Then click color.

    The click the "*Reactivate ATI Color Control*" button.

    very stupid and very basic, I'm not sure why this happens - but thi
    definitely fixed the problem, i spent 3 days to find ou

    Good luck
    nawad58, Jan 20, 2009
  13. Flash 103

    LT1Jeep Guest

    I had the same problem with my HP Pavilion, and it happened for no
    reason after i hooked it up to my 50" Plasma ?(which ive done before
    without issues) I messed around with a bunch of different settings, and
    tried hooking it back up to the tv, and tried clone, dualview, etc.
    sometimes the tv would also be dark, sometimes not. weird. so then after
    reading this i looked into the COLOR setting in the Nvidia controll
    pannel and realized everything was set to zero, so i clicked return to
    default and VIOLA! it was normal again. i checked the video drivers and
    realized that they had updated themselves because hte last installed
    date was very recent, so im thinking it was a default mishap setting and
    the color values changed after the update. hope this can help anyone
    else that has been frustrated with this stupid problem. good luck.
    LT1Jeep, Feb 22, 2009
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