I wanted to know what the internal network card is for and found 1 answer from Yahoo answers. It's wrong.?

Question

I have 2 Dell D620's. One is 2 months older. Both are 2ghz. The one power supply packed up and I have to change the power supply from one to the other. On the newer laptop this message appeared, "Internal network card is inactive to save battery power." On the other nothing shows up. When I insert the power cable again into the new one it says "Internal network card is active." The answers I found speaks of servers and networking. You are brought under the impression that the internal network card has to do with normal networking. I unplugged the new one got the message to save battery power and the network to my other laptop is still working as well as surfing the internet. I broke open the broken power supply and there are 3 wires leading to a PC board. One is earth, then Volts, to power up the battery, and a third wire that says, DATA. Inside are transistors, 2 transformers, resistors and something that looks like a rolled up copper wire. What gives?

Answer 1

The network card lets you connect to a network, a router or a DSL modem so that you could connect to the internet. The network card is just one of the many devices inside your laptop that requires power.

You should not tinker with that adaptor if you have no basic knowledge of DC power supplies and a multi-meter.