what is the blue wire in laptop power adapter

[says]

need a hp laptop powersupply wire diadram

 

[jarotech]

Hi, what model of HP do you have?

 

[says]

I dont. I. Need to knoww whst the blue wire is

 

[jarotech]

How many wires do you have, and what colours.

 

[says]

2 Red 2 black and 1blue

 

[jarotech]

The Red are the positive wires (+), the Black are the negative wires (-), and the Blue is for informations between the adapter and the laptop.