How easy is it to damage an IBM CGA display?

There was an urban myth back in the late 80's and early 90's that there was a virus going around that could alter the scan rate of a video adapter so that it would blow out the monitor. Never saw any such damage to a monitor in person, so I don't know if it was just a myth or actually existed. Used to see the little cap in the corner of hercules cards pop and flicker on fire though, that was always neat. Nothing beat the Bernoulli boxes, the originals in the XT cases, there was a design flaw in the power supplies, they had these big honk'n coke can sized caps on them and they would explode! No kidding, I used to work at a downtown financial client and this one floor had dozens of them hooked up to AT's and such and every once in a while you'd hear this BANG!!! It sounded like someone smacking the XT case ontop with a hammer. Sure enough you'd open up the case and the underside would have this black mark were the cap exploded. Bournelli issued replacement p/s' and the problem went away :-) Curt Jim Leonard wrote: