I wish to join the voice as well. Have got HP pavillion dv2535ea for 640GBP and that does have nVIDIA. Initially i used to get and error as display driver crashed and then when I restart my laptop for my surprise I saw 6small screens with different colors coming on the HP logo when the laptop boots and windows loading progresses.
Finally a blue screen appears and says "Memory parity error, Hardware malfunction. Please contact your provider"