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  1. #1

    Member Since
    Feb 25, 2011
    :::weird white screen plus staircase colored flickering dots??:::
    whats up everyone. this is my first post here on mac forums. I have this issue with my 4 year old 17inch imac. I tried doing some research on the issue but i cant find my specific one. When i turn on the comp i just had a white screen. Then after some recommendations i reseted the memory by doing command option RP. Then these staircase colored flashing dots started happening but in the background i see the OS booting up. Once it finishes booting up i have a white screen and I cant see anything other than a white backdrop and the staircase colored lines.

    here is a picture for reference: I really appreciate any advise!!
    this picture is of the computer already "loaded."


    Uploaded with[/IMG]

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    It looks like a graphics processor problem. Try attaching an external monitor to your iMac and see if the same thing happens. If you don't have a spare monitor, a TV can be used. Post back the results and we can go from there.

  3. #3

    Member Since
    Feb 25, 2011
    i think im going to have to buy the monitor adapter because i dont think the computer came with it. :/

  4. #4

    Member Since
    Feb 25, 2011
    bump, havnt had time to take it in.

  5. #5

    robduckyworth's Avatar
    Member Since
    Jan 04, 2011
    Reading, UK
    15" MBP, 2.5GHz i7, 750GB, 6770M 1GB, iPad 3, iPhone 4, custom PC
    that is a tell tale sign of a broken graphics processor, as chscag says.
    If you find a post helpful, don't forget to use the reputation system (top right of post.)
    Join us in the IRC! How? Add me on Steam, Origin or PSN (Vita): robduckyworth

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