I bought a slightly used guitar with the receiver for my ps2. I put the receiver in the slot and I turned on the guitar and the guitar blinks red and so does the receiver, but the receiver isn't picking up the guitar's signal. I've pressed the button on the receiver and changed the batteries in the guitar and it still doesn't work. I already have another guitar and receiver and they work fine, but this one doesn't. I emailed the person I bought it from, and they said i have to sync them but I don't know how. Does anyone know how to sync them or what else i should do?