After many, many years of computing I have unfortunately become familiar with EHT Flashover- where an otherwise-normally-functioning-monitor will suddenly produce a sharp cracking sound, the screen with distort and then it will return to normal.
I had a 5 year old monitor die like this- the cracking progressively got worse and then one day it just wouldn't come back. No biggie, this sort of thing happens.
However, I had a situation yesterday/last night which concerned me and which I was hoping someone here might be able to illuminate:
I have 3 monitors, all old. A - 14 y/o, B - 8 y/o, C - 6 y/o. All CRT. I received C from my friend and have been enjoying the heck out of it until, yesterday afternoon, it started arcing. It increased in frequency until I had to shut the machine off, unplug it and put monitor B in there.
With monitor B I didn't hear any arcing but I did notice slight resets of the picture (where the screen seems to move up or down one pixel or so every 20-30 seconds or so). Anyway I woke up this morning, and it looked like monitor B had been killed. It was making a weaker version of the EHT "crack" sound with the same frequency as monitor C.
Now, because I suspected that it was something electrical I've changed out the power strips that run the computer and even the power cords which power the various monitors I've hooked up. I have even changed out the video cards that were being used- they are all AGP 3d cards, FWIW.
Nothing seemed to change the situation.
I am petrified that:
1. Somehow, maybe, the power supply on my computer is somehow sending some freaky charge down the VGA cable to the monitors I plug in causing this.
2. Somehow the power coming from the wall is causing this.
The rest of the computer, for the most part, seems to work just fine. I've been using monitor A for my laptop because the LCD screen is partially damaged and it's just chugging along fine in another room.
Because of this happening with two monitors yesterday, which would otherwise seem to have been in good shape, is this just a coincidence or an indication of some other issue?
Sorry to be so wordy but I wanted to give as much information in hopes of this ringing a bell for someone out there.