Most times reseting it or unplugging it will solve problems like this.

If it doesnt see if you can FTP into it and/or telnet into it. If you can FTP into it atleast you know if is accepting some form of logon. Next try telneting to port 80 and see what you get?

If you have a port scanner installed on your computer already run it against it and see if port 80 is open.