You can't switch off the green light, you have to pull the cable out of the power plug. Just seems to be a green led light.
No longer consumes like the power supply you had before. The green standby lamp hardly matters… Maybe 5 cents a month
And what if it is used up and goes out, does it harm the electricity connection?
What is consumed? I don't understand your question right now?
Why don't you just take a multiple socket with switch?
So you are sure that the monitor etc. Does not draw any electricity.
Your notebook consumes around 4 euro a year if you charge it every 2 days
The light goes out? After all, it's on for 24 hours.