IMac 27" Static Flicker when using Displayport In from Macbook Pro

Hi all,
Sorry about the long title
I have a late 2009 27" iMac with ATI 512Mb 4850 card and 8Gb RAM. I also have a 2011 Macbook Pro that I connect to the iMac via Displayport to use it as a screen.
The iMac sometimes displays an annoying flicker and "static" like screen issues when displaying the Macbook Pro screen. This does not happen all the time but seems to be more prevelant when I have had the machines on for a long time, or if I use them in the morning after they have been asleep through the night.
I've tried the cable (a Belkin one) both ways round and have tried wiggling it at certain points to see if that changes the static but nothing happens. I have also purchased a cable from Apple, but I did not realise it would only work for Thunderbolt drives, not displays.
I have a video of the issue here:
https://www.dropbox.com/s/1nkykc8j13qg9px/2012-04-13%2014.32.38.mov
Any ideas?
The only thing that I have chaged about the iMac since purchase is I now run the OS on an external Firewire drive as the internal HD sounds like it's failing (it makes a very loud seeking noise ALL THE TIME and slows down a lot when the machine has been on for a while. The external drive does not do this).
Thanks
Ryan

Hi, sparky96,
I do not have a satisfactory solution. The best I can do, as a work-around, is adjusting the iMac to its brightest setting, moving the MacBook Pro brightness several notches darker, and then aiming for a compromise in the image I'm working on.
As a result, I have no idea what someone else sees on his or her computer. However, that might be the case even if I could match the images on my two Macs. Others might have PCs that display reds as browns, for all I know. I do know that when I view a video on YouTube, it looks more or less the same on each of my computers. The human eye seems to make its own interpretive adjustments.
I have similar problems preparing artwork for printing. No matter what I do to calibrate the displays, the output from my various printers never looks right, and when I get back a book cover that's been printed on an offset press, I'm happy if it's reasonably close to what I get from my desktop printers.
I wish Apple, and Adobe, and Hewlett-Packard, and commercial printers and the whole industry would devise some kind of universal standards -- but I doubt that will ever happen.

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