Installing ceiling fan, but no ground wire from ceiling?

Hi, last year I bought an older home. Today, I decided to install a ceiling fan in one of the bedrooms because it gets pretty hot in there.

There was already an old ceiling fan up, but it didn't work.

When I took the ceiling fan down, I noticed there were only 2 wires coming out of the ceiling. A black one and a white one. There was no green "ground" wire.

So, this new ceiling fan I bought has 4 wires to hook up--black, blue, white, and green.

How would I hook these up?

The simpler the answer, the better for me. I don't know much at all about electricity.

Thanks!

Answers:
Alex is partially correct. The green wire connected to your metal box will do nothing if there is not a ground wire coming into the electrical box. If you have a fault, it will travel to your electrical box and make it live.

Your ground wire needs to go to earth. This is typically done in a house via ground rods, ufer ground or metal water pipes that extend 10' beyond your outside connection.

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