Hold my beer. I once had a fairly large CRT monitor which most of the time worked fine, but sometimes would show a warped, distorted image. After a while I noticed that warping was happening only on rainy days. I opened the case and discovered gooey stuff smelling cat urine on the monitor's electronics. Washing it with pure alcohol solved the problem. I have no idea what was going on there, but I consider my cat was an extremely lucky dude as I almost never turned that monitor completely off.
Before you blame your cat, consider the possibility of an exploded electrolytic capacitor. Among many other foul comparisons, I’ve heard people say they can smell like cat pee after they die.
