MacBook can no longer connect to the Internet in anyway

I have a 2007 MacBook which has always connected to the Internet with no problems until the other day I turned it on and could not connect to the Internet.

I have tried Wi-fi and Ethernet and it says it is connected yet when I open my browser (I have tried safari and chrome) it says it cannot connect to the server or, with chrome, the connection attempt was rejected.

I have tried this on my home network and also at work and it is the same.

I've checked my settings against other discussions on the forum and tried things like flushing the cache but no luck!

Please help!

Thanks