low battery or not turned on properly?
it depends if you get it wireless
No, you can use the guitar hero 3 controller, which is wireless, for guitar hero two
Yes they will work
yes you can i have all three of them and they all work with the wireless guitar (thank god)
yes
No, but in Guitar Hero 5 it works!
Yes, It should.
Guitar Hero™ Kramer Striker Wireless Guitar Controller
not the wireless guitar but if it was wired than you can
Yes, all the guitar hero controllers (GH 3-6) will work, so you can use a GH 6 guitar on GH 4. ect.
By plugging in the wireless dongle to the controller port.