My dell computer screen flashes black for a half a second or a second at random intervals (anywhere from once a minute to every couple of seconds), but the system has not frozen, as I can continue to type, music keeps playing, etc. I found a site which suggests that it is my AC socket or adapter, but the same problem exists on battery power. Any idea what's up?
loose monitor cable, bad monitor, bad backlight inverter, bad GPU, bad power supply.
I will assume its a laptop though. In which case hook it up to an external monitor. if it doesn't happen the laptop screen, backlight, or bavklight inverter are going, or there's a lose cable. If you point a flashlight at it while its "black" and can still see the screen image I'd say replace the inverter.