Internet connectivity problem on a Dell Optiplex 755
I have a really strange issue. I have a dell optiplex 755 desktop PC with Windows 7.
I cannot connect to the internet via ethernet or my usb wifi adapter. I am connected to the network but cannot get the internet to work.
The pc gets an IP from the DHCP correctly and I have made sure the DNS settings are correct and also tried google's dns.
I thought there may be a problem with the OS, so I did a full reinstall, and I get the exact same problem. Same problem, whether I use ethernet or WiFi.
I have also tried the same PC with a different router in a different building and get the same problem. I have installed all the drivers possible to see if it will make a difference. The NIC is a Intel 82566-DM Gigabit
What does work is if I boot from an Ubuntu Live cd - internet works without a squeak through ethernet. I know there is definitely no issue in my wiring or router as all other PCs connected to same wire work fine.
Anyone come across such an issue before
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