My Desktop cannot connect to the internet! (Ethernet)?

[160]

My desktop cannot connect to the internet. It is using a wired connection. I tried connecting to the internet both wired and wirelessly with my laptop and it was able to access the internet both times. I used the same ethernet cable for my laptop and desktop too. Could this be a hardware problem for my desktop, or could there possibly be settings on my desktop that are screwed up within it? When I plug the wire into my desktop, light from the plug comes on, both green and orange. And when I look at my modem, it shows that my desktop is in fact connected to it. The bottom right corner of my desktop shows that there is a computer screen with a caution sign in front of it, meaning "No internet access". Please help!
Ive already done that. Those didnt work.

[Nisia]

Restart your router:

Turn it off
Unplug all cables
Wait 10-20 seconds
<<In the meantime restart your computer>>
Plug your router back
Check if the problem is fixed.

[Comicbook Reader]

Start by rebooting your modem. Unplug it, wait a few minutes and then plug it back in. Shut your computer down and boot it up. That usually claers things up.

[Mike]

I'll assume that your router assigns the IP address. Make sure your desktop doesn't have a hard coded IP and DNS IP addresses listed. Generally you'll want this set to DHCP.