i have rockband for the wii and suddenly the blue pad stoped functioning, and my warranty expired a while ago.

anyone knows if i can fix it myself? because i heard somewhere that it was easy and i even remember seeing a video of someone doing it, but i cannot find it, so if anyone knows, i´ll apreciate it.

It is probably a bad sensor under the pad. These are easy to get to, just pull the drum head off and turn it over. I think 2 screws hold the sensor on. I'm not sure where you can find a new sensor, but you should be able to swap them out pretty easily. I would try Radio Shack if you live near one.
Hope this helps.

i do have a radio shack near me, i don´t know what kind of sensor it utilize, but i´m gonna try my luck and see if i can find it, thanks