Having problems with your Apple Computer Monitors ?

I am using an Apple 30inch Cinema Display with a MacPro Desktop. Occasionally, Lines would appear on the screen and I would have to restart my computer, but not the screen, upon start-up, has a number of lines that will not go away, the screen will sometimes shut off without warning, and sometimes the gray start-up screen with the apple will freeze with a bunch of lines and black boxes.


Answers :

This sounds like a video card issue with the Mac Pro, have you tried testing the display with a different computer? \015\012
\015\012Next, check for any software/firmware updates from Apple and install if necessary.\015\012
\015\012Next, I suggest resetting the SMC to flush out any legacy niggles, this can be accomplished by following these instructions as provided by Apple.\015\012
\015\012To reset the SMC on a Mac Pro:
\015\012
    \015\012
  1. From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
  2. \015\012
  3. Unplug all cables from the computer, including the power cord and any display cables.
  4. \015\012
  5. Wait at least fifteen seconds.
  6. \015\012
  7. Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer.
  8. \015\012
  9. Press the power button to start up your computer.
Another way to reset the SMC on a Mac Pro computer is:
\015\012
    \015\012
  1. From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
  2. \015\012
  3. Open and remove the metallic outer door.
  4. \015\012
  5. Press the SMC_RST switch that is located slightly below and to the right of the row of diagnostic LEDs. Use a non-metallic, non-conductive object, such as a wooden pencil. Note: Mac Pro (Early 2008) does not have an SMC_RST switch, refer to the reset procedure steps in the previous section.
  6. \015\012
  7. Replace the metallic outer door.
  8. \015\012
  9. Press the power button to start up your computer.
\015\012If the problem persists and you have identified that the problem is definitely with the display then any further information you can provide would be most helpful in diagnosing the problem - otherwise, if it is the video card then (assuming it's still warrantied) get in touch with Apple. If out of warranty then I'm sure we can guide you through the replacement process if needed!
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