Works for a while they starts going nuts

[cyberlot]

Computers been running 4 days now, going into sleep each night.. Now every 3/4 seconds my whole screen blinks in and out and I will have to reboot to clear it.. before I do attaching logs and sending..


The funny thing is its always my primary monitor, not the displaylink one that starts to go nuts.

[Carlo]

Most likely it's the known i5/i7 issue already reported multiple times on the forums. Try to turn off Automatic graphics switching in the Energy Saver preferences.
Or, better, try to upgrade to 10.6.5 as it might have fixed this issue.