[Orpheus]

Okay, I misunderstood. FWIW "flatscreen" means a CRT that has a [nearly] flat screen. This term was established a good decade before today's reasonably priced LCD monitors.

It does sound like the problem is with your monitor. You'll have more luck getting an LCD fixed than a CRT, since, unlike the high internal voltages (thousands of volts) of a CRT, it's mostly digital-circuit voltages internally, except for the backlight power supply (which is a small circuit tucked out of the way)