Monitor flashes on and off

When it comes back from BLACK is it like a Power ON with the display intensity coming up gradually, OR does it POP back with an INSTANT ON - like appearance.

Slow appearance would indicate basic Power loss to the Monitor, or failure of the internal Low Voltage inside the Monitor's Power Supply.

Instant OFF/ON would indicate either:

1. Loss/regain of Video Signal

2. High Voltage Loss/Regain within the Monitor. This would be accompanied by a 'crackly' high voltage 'staticy' sound.

So, what's the further story???