cooling fan running all the time

[1cookie]

I have an all in one Hp computer and the cooling fan is always running. 

[itsmyname]

@1cookie -- the cooling fan is always running. 

This is normal. But, do you mean that it is VERY NOISY - running at 100% speed, with 100% "noise" ?

Are you living in Hawaii, or south of the Equator, where the room-temperature is quite warm?

Trying to "cool" a computer with such warm air is difficult.

So, your motherboard speeds-up the fan(s), to try to increase the amount of air-flow.

Or, you could have a failing fan that is not slowing-down after the motherboard has told it to slow-down.

This seems like a task for a certified computer technician, to trouble-shoot, and maybe to disassemble your computer, to verify that the fan is the cause of the noise.