Witnessed screen go dim and negative...help.

Discussion in 'iMac' started by mykyl, Jun 15, 2011.

  1. mykyl macrumors newbie

    Jun 15, 2011
    This past Sunday right at 4:15 a.m. when I was surfing I witnessed my screen on my iMac make a sound and then went dim. I mean dim. It also went into a negative state. It's a 2.16 Ghz Intel Core 2 Duo with 3 gigs of ram.
    I've been through all the setting for brightness and changed it around from positive to negative in Universal access but it's still very very very dim. It works perfectly with everything else. It's just super dim.
    So I have an extra monitor and hooked it up to the output on the back of the iMac and I am mirroring the screen. The external looks normal.
    In Universal Access, when I choose Black on White...the iMac is in a negative state and my external monitor is positive and it looks fine. When I switch to white on black my external goes negative and my iMac goes positive but is still very very dim. I've called Apple and since the warranty is up on it...nobody wants to give me a low and high ball park figure over the phone of what I might be looking at in cost for repairs or what the issue may be with this. Any help would be appreciated.
  2. MacHamster68, Jun 15, 2011
    Last edited: Jun 15, 2011

    MacHamster68 macrumors 68040


    Sep 17, 2009
    sounds like the inverterboard is gone, at least would explain the extreme dimming (inverterboard gone backlights out)
    because if i understood your black on white white on black right the external reacts like it should, means the gpu seems ok
    inverterboards are not that expensive roughly out of my head i'd say £50

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