Internet has stopped working

[MAX POWER]

My Internet has stopped working. my second computer connects to the interent through my main computer through a network, but for some reason it won't connect and I hav'nt done anything to it. The network still works (it detects the other comuputer) but it wont connect to the internet.
please help
Jamie

[PhilEnfield]

What OS ?

Also ... are you saying your second PC cannot connect or both ?

[Neo]

Can you succesfully ping outside your LAN?

[Stryker_PornStar]

Have you attempted to repair your network connection?