Cant access the Default gateway

Question

Yesterday I just flashed the router firmware, then i tried to go onto the gateway and it wont let me it just gives me a unable to connect page. I used the Command prompt to check the default gateway but it showed up as nothing. So i tried a static IP and all i can access is the Home Page and nothing ELse everything else just gives me a 404 Error Saying Page not found.

Any help would be appreiciated~