7800N Internet Connectivity on new PC

[JamieFish]

Hi, I've just brought my new desktop home from university and am having issues connecting to the internet via our 7800N that have me stumped.

The desktop is connected using the ethernet port built into the motherboard, which is the same way by which it was connected to the university at university (Virgin Media Router). I don't have a wifi adapter so unfortunately can't test it through wifi. I've tried both connecting through both (EDIT) Ethernet over Powerline and with a wire direct, with exactly the same results in both cases.
It appears to connect to the router, and has a local IP address, as well as appearing in the DHCP table in the router. However, windows 7 displays a yellow warning triangle on the tray icon and says "No Internet Connection". When I attempt to browse the internet, Chrome says that DNS Lookup failed. I seem to be able to see other computers on the network, but I can't ping or access them, however this could well just be firewall settings as they might not be set up correctly for sharing (although I thought my laptop was).
I've tried turning the router and PC off and on. All other computers in my house have no problem connecting to either ethernet or wifi.

Any suggestions that people have will be very much appreciated.

Thanks, Jamie

[Jimmy06]

One thing I will point out is Power over Ethernet is exactly what it sounds like Power over Ethernet and not what I think your referring to that commonly known as a Homeplug. Back to the question check the Ethernet settings on your machine and make sure that the IPv4 Protocol is set to Obtain by DHCP for both IP and DNS

[JamieFish]

Thanks for pointing that out, corrected! The settings you described were already correctly set.

[Jimmy06]

What version of windows are we talking about ?

Also in a command prompt (Windows Key + r then type "cmd" and click run) and then ping the router ip address. If its set to defaults thats 192.168.1.254 "ping 192.168.1.254"

[JamieFish]

It's windows 7, pretty much up to date with windows updates. When I try to ping the router I get the error "Request timed out.". When pinging from my laptop it works perfectly so it's the correct address and should be responding.

I can also ping my Desktop (the one with issues) from my laptop and get a response, but not vice versa.

[tinytim]

Sounds like a firewall issue perhaps.

[JamieFish]

I've tried disabling the firewall on the computer. Feels almost as if the router is blocking connections somehow

[Tomken]

You could try these cmds as an Adminstrator from the cmd prompt to reset a few things in the computer, pressing Enter after each cmd.

netsh winsock reset catalog
netsh int ipv4 reset reset.log
netsh int ipv6 reset reset.log
ipconfig /flushdns
ipconfig /registerdns

And though it's being assigned a valid IP address, you may as well add these cmds

ipconfig /release
ipconfig /renew

Then reboot.

What AV are you using and have you tried the connection when booting up in Safe Mode wth Networking and are there any yellow alerts against the Network Adapter in Device Manager ?

If you are still unable to connect after those then check to see if all services are started.

COM+ Event System (for WZC issues) - Default is Off for Vista and Win 7.
Computer Browser
DHCP Client
DNS Client
Network Connections
Network Location Awareness
Remote Procedure Call (RPC)
Server
TCP/IP Netbios helper
Wireless Zero Configuration (XP wireless configurations only)
WLAN AutoConfig (Vista & Windows 7 wireless configurations only)
Workstation

You can check the services by typing services.msc > Enter from Start

All of these services should be started and their startup type should be automatic or perhaps manual.

If a service is not running, open it's properties and check the dependencies.

Check each of the dependencies and see which one is preventing the service from running.

You could also check the Event Viewer to see if anything is showing up in there.

[Jimmy06]

I was going to suggest what tomken has.

[JamieFish]

Thanks for all your help, I really appreciate it.

Unfortunately none of the solutions you suggested have fixed the problem. I have also tried restarting in safe mode with networking and have checked the services you pointed out are started. The only one that isn't is WLAN AutoConfig, presumably because I'm connecting over ethernet only. There's no problem in device manager.

The AV I'm using is Kaspersky but I've got it disabled at the moment.