Have tryed it in a differant room in case it wasnt getting enough power for whatever reason, also tryed differant power cords. Still nothing.
I would imagine a loose connection maybe or else a faulty psu maybe?
The computer was custom built by a company (wont mention) and they should have done tests I would have imagined so this is weird.
Will give the shop a call in the morning but any ideas what could be causing it? I dont want to open the case as it is under warrenty though. (having just picked it up today)