Just an small update, today I send my N900 in for repairs, about the dead pixel problem, dust under display, and slider that seemed loose when closed. Unfortunately Nokia only has a 7 days DOA policy, so not possible to get a new device, even though I tried hard .

But if it gets fixed, than it is ok, a new device is always to prefer, but the chance is quite big to get another one with same or even worse problems.

Anyway will keep you updated, and see if this pixels problem can get fixed by turning the device in to a service shop .