This number has apeared in the top left hand corner of the monotor, when I come to close and turn of the screen goes all colours from Green , blue, grey etc. Whats the matter and how do I put it right

Bow, July 2008

TSUM16AL N 170SX01 ?
This number has apeared in the top left hand corner of the monotor, when the computer goes to sleep mode the screen goes all colours from Green, blue, grey etc. Whats the matter and how do I put it right
this has never happend before and i don't know why it just started - i never signed up for this or anything and am not happy about this intrusion

lt, October 2012

Problem solved, just dissconnect monitor and restart

bow, August 2008