TI Display gone crazy

[avastar]

Hi,
Since last week the blue display of my Access virus TI desktop has gone mad. The center of it is still ok, but on both sides (2/3 of the screen surface) i can't read it anymore because it's messed up with plenty of black dots. I didnt change anything when it happens. I have OS3, and tried to reinstall it but no improvement. I tried to unplug it, replug, no change.
Do you think it's good for trash? It's 2,5 years old, i am not sure the warranty is still applicable.
Did some experience the same trouble?
Thanks