Not booting up/ crashing with squares on screen.

Discussion in 'iMac' started by robmcginley, Jul 29, 2010.

  1. robmcginley macrumors newbie

    Jul 29, 2010
    Hi Folks,

    I have a 10.4 iMac. Recently when using it the screen starts to pixelate with large random squares and effectively makes the computer useless. Either that or I get moving multicoloured flashing squares (very psychodelic)Also on booting up the grey screen with the apple logo has dark grey sqaures and then when it goes to the blue screen has a series of smaller squares top and bootom. The booting up stops at this point.

    I have ran the disk doctor, but it doesn't seem to have made any difference.

    Sometimes it boots up ok and then after some use starts to crash? again.

    Any ideas?

    Thanks in Advance Rob UK

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