• am running a two monitor set up on my mac pro (23" cinema hd monitors) one has decided to be a bit difficult, it will work intermittently. Wake the mac from sleep and it refuses to come on, sometimes if you wait it will come on, sometimes not. I know it's functioning as I've plugged it in as a second monitor into my mac book air using dvi to mini dvi adaptor. I've plugged my other monitor into the dvi and mini dvi connectors and they are working correctly. Not sure if its the bundle of cables from monitor to computer which is at fault, and if they are if a replacement can be purchased, or if it would need to go to an engineer, or if a software reset needs to happen.
    Any thoughts.

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