Laptop connects to wifi, but no internet

Well since yesterday my laptop can't really go online anymore, I haven't really done any changes to the router at all, but the laptop kinda just stopped. There's no spyware, viruses or anything. It connects perfectly fine to my wifi, but can't get any website. I've tried disabling WPA, and Mac Filters, and got nothing still getting the Firefox and IE message, Unable to connect.

>>1
How many machines do you have trying to connect to the internet at any given point? It could be that your ISP only gives you a certain number of IP addresses, so when your computer tries to request an IP from your ISP's DHCP server it doesn't get one, but you can still connect to your local network.
If you can ping other machines on your local network, that could be what's happening. If not and you're sure nothing has changed, try replacing your network cable. Faulty cables can give mysterious errors.

>>2
This sounds like a DNS issue.