LINES AND DOTS ALL OVER THE SCREEN!! ... AGAIN!

howdo,
I recently got a new 20" intel mac, after less than 24hrs the display has all kinds of weird lines and dots all over it, it kept flickering. Funny thing was that if the machine was then turned off, after about 20mins everythin went back to normal. This happened a few times and after a couple of call to Apple the machine went back, they replaced it with a nice new one ... problem solved??
Not quite!!
The second machine has been fine, after almost a month with no problems the dreaded lines/dots and flicker have reared up. I thought maybe it was something external causing interference, so removed my sound sticks and all other electrical stuff like lamps etc but it is still happenin intermittantly.
Anyone got any ideas?? or am I gone end up throwin the thing out of my window???

Ok
The only peripherals were Harmon kardon soundsticks, these have been removed, and a canon printer. The printer seem to be fine. Other electrical stuff in the room includes:- 2 READING LAMPS/ AN IBOOK G4/ POWERBOOK G4/ AN ADVENT LAPTOP/ ANOTHER CANON PRINTER.
I cant understand how these would affect the screen but its gotta be something like eh.
The only software that has been added is IWORK 06/ MICROSOFT OFFICE MAC/ MACSWORD.
The problem usually happens when the mac is left asleep rather than closed down or if it is left on without being used????
Any suggestions would be greatly appreciated!!

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