I have a Sony VGNAR-520E it has a Nvidia 8400MGT. The card is defective, got the destorted screen, artifacts. the black screen. Called Sony, long story short, i was told I had the defective chipset by 4 diffirent Sony retard customer service people including two tier 2 service managers. All 4 people said it was a defective chipset, but because my model of lap is not on there list of free fix's I get ZERO! Exact words of the last tier2 manager "You have a recalled computer, but its not recalled"
Thats what they told me. Sony Sucks! Oh ya Laptop is only 1 1/2 old and cost $1200 new. Google sony complaints and read about the great Sony customer Service from this thug, rogue company!