Network problems

When I booted up my pc yesterday, I found that my internet stopped working. The network adapter is no longer detected and when I look at the ethernet port, I don't see any lights blinking (which is usual when you have a connection).

I tried removing and installing the latest drivers, updating my BIOS, looked in the BIOS if Ethernet was enabled. This all didn't work, so I bought a PCI network card (really need inet asap). Installed it, the lights started blinking on the card when I booted up my pc and connected the internet cable, but when I entered windows nothing was detected. I can't see the card in the device manager, and no network adapters show up at the network centre. Also, when I look for new hardware it can't find anything

I'm clueless on what to do, and I need my internet bad for my study!
Help would be greatly appreciated!

Specs:

Mobo: GIGABYTE GA-B85M-D3A
OS: Windows 7
Recently installed network card: Sitecom LN-027 (plugged into PCI port 2, because 1 is blocked by my GFX card)
GFX: Geforce 560 GTX
MEM: 2x Crucial Technology BLT4G3D1608ET3LX0 4GB DDR3 1600 UDIMM
Comments
3
checked the cable?
The cable is fine, and the network reception too (several people are using the network). It's really an either driver or hardware related issue, I just can't seem to work out what..
May I add that I now have a temporary solution by connecting an ethernet to usb device. This will not suffice on the long run though, so help would still be greatly appreciated!
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