Just collected my iMac from Bluewater store (UK) after it had the HDD replaced under the recent recall (1TB Seagate drive). Inspected the unit in the shop only to spot two smears on the inside of the glass, they took it out back for 15 minutes and removed the smears. Just got it home and noticed that there is a problem with the LCD panel 
It is difficult to explain but random individual pixels keep flickering, you can really only spot them if you make the screen black. looks like interference but having now unplugged pretty much everything that might cause interference i am certain the fault lies within the machine. It was absolutely perfect before it went to the shop. It is a bit like several planes in a night sky with their twinkling lights.
I am going to have to contact them tomorrow and I guess they will insist I make the 50 mile round trip so they can check it out!
Really annoyed
Daniel
It is difficult to explain but random individual pixels keep flickering, you can really only spot them if you make the screen black. looks like interference but having now unplugged pretty much everything that might cause interference i am certain the fault lies within the machine. It was absolutely perfect before it went to the shop. It is a bit like several planes in a night sky with their twinkling lights.
I am going to have to contact them tomorrow and I guess they will insist I make the 50 mile round trip so they can check it out!
Really annoyed
Daniel