Looks to me like somebody bumped it hard in that closed, perhaps more than once. What you see there is usually a sign that some of the LCD connections went open, and these are on the very edges of the display panel. So any hard hit from the side (or top/bottom) can cause that.

There is a small chance the electronics is just going crazy due to dead capacitors in the PSU, so perhaps worth investigating if you have the skills to repair that. Otherwise it's most likely junk now.