This issue is can be caused by loose cable
connections or a loose DVI graphics card in the computer. Check cable
connections and verify there are no bent pins.
Ensure that the DVI graphics card is securely connected in the computer.
You can also try this procedure with your Mac:
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-PRAM RESET -
Here are some steps you can
try to resolve the issue:
• First, hold in your power
button for approximately 10 seconds to do a hard shutdown, if you have not
already turned your Mac off.
• Once your Mac is shutdown,
you will need to perform what is called a PRAM reset (Parameter RAM)
This should help with the
freezing issue:
• Locate the following keys
on the keyboard: Command, Option, P, and R. You will need to hold these keys
down simultaneously .
• Turn on the computer.
• Press and hold the Command-Option-P-R
keys. You must press this key combination before the gray screen appears.
• Now, hold the keys down
until the computer restarts and you hear the startup sound for the third time.
• Release the keys and allow
the Mac to start up.
• Please update me to let me
know if this works.
A PRAM is a good troubleshooting procedure for display issues.
If this does not work, this may be a genuine issue with the graphics card in your Mac, more so, than 2 monitor just burning out. You may need to take the Apple ADC 17" in for service, if the procedures above fails.
Reply back to this post if you have more questions.
Regards,
-Mactechtrainer
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