A couple of years ago my 17" monitor went bad. It was still under warranty, because it was less than 2 years old, and so I had to call tech support for them to authorize shipment of a replacement.
The monitor would do nothing but display a rather amoeba-like (shape changing) green mass on the screen, regardless of whether the monitor was plugged into the video card with the computer on, or it was not connected to the video card (thus in ‘Self Test’ mode).
So I call tech support and explain the situation to the male on the phone.
TS: Now missss… are you sure the monitor is connected to the computer? There’s two cables coming out of the back, and both of them do have to be plugged in properly.
CS: Yes, the monitor has AC power and is connected to the video card. I’m looking at the cables right now.
TS: Misssss… are you sure you’ve got it plugged in to the video card?
CS: Yes, I’m sure. Ten minutes ago, I had a picture. Now I don’t. I checked to make sure the connector hadn’t come loose.
TS: What operating system are you using again?
CS: Windows NT.
TS: Oh. Well. There’s your problem Missssss. Your monitor is not compatible with Windows NT.
CS: Could I speak to someone else please?
TS: Look, Missss, you may not know much about computers, but montiors have to be compatible with the operating system, and your monitor is built for Windows 95.
CS: I’d like to speak to someone else. Preferably a supervisor. Because I am quite sure this is not an operating system problem.
TS: I already told you your monitor is not compatible with Windows NT. You need to uninstall it and use either Windows 95 or 98.
CS: Hold on, let me boot into 95.
TS: Do what Missss? That’s not possible.
CS: Look, you obviously don’t know your head from a hole in the ground. The operating system has no bearing on whether or not the circiutry in the monitor has gone bad. Now, I’ve got your badge number written down and if you don’t transfer me to a supervisor in about 3 seconds, I’m going to find someone who will and let them know what an arrogant, condescending, ignorant turd you’ve been for the duration of this call.
At that point I was transferred to his supervisor, who apologized and within 5 minutes was ready to ship me a replacement monitor.