TCP IP not working

Could you give us some more detail?

verify link state...

Most network cards have an indicator on them that gives you a basic idea whether the port is active
also the hub/switch that this is plugged into should also have an indicator...

If the light is down, your port/card is dead or your cable is bad, try switching to another port, network card or cable.

If the light is green verify the network card and the hub/switch are set to match speeds, either 100full, 100 half , 10 full or 10 half (I doubt if your running gigabit)

If you tell us what hardware / os your using We can be more specific on how to diagnose these things

That's right check the blinking light, and see if you can manually assign IP on to the device and communicate within your LAN. :-)

Additionally, you need the right kind of cabling - you PROBABLY need a Cat5 or better straight through ethernet cable.  If you want to connect similar devices, you would need a cross over cable.

As everyone said, we need more details - what OS, what kind of device(s), what kind of network equipment, etc.

Thanks for the input. It turns out that Ad Aware and a few other programs will disable the winsocks ability to receive a TCP\IP number as well as use the network. I found a program called winsockfix.exe that took care of the issue. thanks again for your input. Sorry for the lack of additional symptoms. I actually am a fairly good tech and have been around computers and electronics for over 30plus years.