It seems I don't have the choice of returning the system or asking for my money back. I just got off the phone to a manager at tech support, who tells me that under the terms of the Dell warranty, no matter what the age of system they will never replace a complete system due to technical issues. They will only replace components. My system was delivered on 7th January 2014. I informed Dell of the graphics issue on 26th January 2014 having spent a week assuming the glitches I was seeing came from corruption in my own MXF files.