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  1. #1
    :::weird white screen plus staircase colored flickering dots??:::

    Member Since
    Feb 25, 2011
    Posts
    4
    :::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."

    [IMG]

    Uploaded with ImageShack.us[/IMG]
    TIA,
    Gabe.

  2. #2
    :::weird white screen plus staircase colored flickering dots??:::
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    45,213
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    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
    :::weird white screen plus staircase colored flickering dots??:::

    Member Since
    Feb 25, 2011
    Posts
    4
    i think im going to have to buy the monitor adapter because i dont think the computer came with it. :/

  4. #4
    :::weird white screen plus staircase colored flickering dots??:::

    Member Since
    Feb 25, 2011
    Posts
    4
    bump, havnt had time to take it in.

  5. #5
    :::weird white screen plus staircase colored flickering dots??:::
    robduckyworth's Avatar
    Member Since
    Jan 04, 2011
    Location
    Reading, UK
    Posts
    2,971
    Specs:
    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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