I hav sony vaio vgn-fz11z laptop with Windows Vista Ultimate 32bit and NVIDIA GeForce 8400M GT graphics card. It went black while playing a game. I restarted but it showed black screen with dotted vertical lines and freezed. I restore it in safe mood. It did not show GeForce 8400M GT graphic card but just Standard VGA Graphics Adopter instead. I tried to reinstall drivers (sony vaio orignal) but on restart,it again freezed.
Then i reinstalled fresh vista 32bit. But its just showing standard VGA adopter card. when I Tried to update it with the driver for NVIDIA GeForce 8400M GT graphics card. it refuses saying that driver is up to date. Then i just run the setup file for the driver, it got installed and also shed in device manager as GeForce 8400M GT, but on restart it again hung with black screen with vertical dotted lines. Now i rolled it back to standard adopter VGA card and system boots. System also show vertical white bands as in figure while running or adopter card as shown below.
KINDLY HELP, IM CONFUSED WT TO DO