Upgrade to 10.4.7 causes severe display flicker

I am running a 15-inch MacBook Pro connected to a 23" cinema HD display.
Since the upgrade to 10.4.7, the laptop screen starts to severely flicker after approximately 3-5 minute, rendering it unusable. Moving a window around (even on the 23") will cause large amounts of flickering; the windows on the laptop screen are duplicated for a split second, and then stabilize until the next display refresh takes place.
The problem disappears after sleeping and waking up the machine, only to resurface after another 3-5 minutes.
Re-installing the 10.4.6 backup fixed the issue. The problem came back after re-upgrading to 10.4.7, and went away again after downgrading to 10.4.6 again.
Is this a 10.4.7 issue, or should I have my machine repaired?
MacBook Pro 15-inch Mac OS X (10.4.6) 15" MBP 2.0 GHz w/ 2GB, X1600 with 256 MB

Same problem at my end since i got the MacBook Pro 15/2.16Ghz. On connecting an external display the main screen flickers after 3-5 mins, goes purple (similar to the pics someone posted earlier) and then goes black. Sometimes it comes back for a few mins but eventually both displays freeze - the internal one goes black and teh external one retains whatever picture was on it but no mouse/kbd control is active. I opened a case with Apple 3 days ago and have been troubleshooting it with them. My next step is to revert to 10.4.6 and see if the problem ges away. An interesting twist to this is that my boss has an identical (arrived the same day) Macbook Pro running with an identical external display attached and does NOT have this problem. The difference between our instals is that i run some additional apps such as Ms Office & AdiumX.

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Upgrade to 10.4.7 causes severe display flicker

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