MacBook Pro does not recognize Ethernet cable or connect to wireless

Today when I turned on my computer, it suddenly would not recognize any kind of Internet connection. The Ethernet cable that I use every day now shows up as 'unplugged' even though it is plugged in. I have tried using a different cable, and it still shows up as unplugged. When I try to connect to the Internet wirelessly, there is always a connection timeout and I can't connect. I use a self-assigned IP address and I've never had this problem before. I've also reset my PRAM, but it hasn't helped. Any suggestions?

try suggestion by "KYLEWONT". If you are still unable to connect to internet then issue is either with n/w settings on comp or h/w. You can drag & drop systemconfig folder in MacHD/Library to desktop which contains all settings for network. Restart comp & that should fix problem related to s/w.

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