May be is not the modem. What browser and OS are you using to access the forum?
I have actually done that(unplugging the modem) but the manual to the modem give a whole different set of instructions for doing a reboot. I clear the cache and cookies on almost a daily basis, sometimes a few times a day. Even clean the hard drive quite often.just unplug the power to reboot modem. clear browser cache and cookies.