On the back of your router, there is probably a power button or switch, which you should turn off for approximately 30 seconds, and then back on. If you're experiencing problems with it, you might also try restoring it to factory settings. Near the power button / switch, there is probably a small hole which may be labelled "Reset". You can insert the end of a paper clip or other thin object into this hole to press the reset button.
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If your Minecraft won't connect to any server simply restart your computer and the router.
You can't restart Empire and Allies only if it has menu that says new game wheres the restart button
A router is not part of the PS3 hardware, you must purchase a router if you need one.
Exit the web browser and restart explorer
If you want to restart, depending on what you mean, you could restart your Wii, or you could start another file on you Guitar Hero. If you do not want to make another file, just delete the game block on you Wii. Those are some of the ways that you can completely restart your game. Hitting restart on the Wii does not completely restart the game files, though.