Open her up, lots of vids online to show you how.
Pull out the drive train (the blue catch cup with the paddles in), the board and battery harness.
Check :
1 ) are any of the wires pinched, ie flattened, as they may be broken.
2 ) is the wiring loom plugged into the board the right way up, it is not keyed though !
3 ) are the batteries dead, use a multimeter or if your me pop in on your tongue and see if they're live.
_________________________________________________________________
Now:
Put fresh batteries in the harness.
Try and turn it on in a quiet place. The board takes the ambient sound level as a base reading so if you happen to be listening to some rather loud tunes at the time it wont spin unless it ' hears ' something louder than your music !
Do you get any pretty lights , sequence of red, orange and green, depending on the board revision ?
Tap the microphone on the board or shout at it........ does it spin ?
If not connect the loom the other way round and repeat shouting at it. Does it work?
Does it sound like its trying but not spinning? turn over the catch cup and undo the three screws. Check the cogs, are they they jamming?
If the motor is spinning but the cogs are not is the pulley o-ring worn and loose or has someone greased the darn o-ring, that was a trend a while ago !
Does the rip drive, the cog on the underneath that you spin to spped manually, spin but the drive cone, thing with paddles on in the catch cup, not spin? You may have a broken drive cone. They have a small plastic tab that engages with the cup and spring beneath it. If this breaks you wont feed.
Again ring Kee or post up on here for a replacement, again I have one for sale ;-)
-------------------------------------------------------------------------
If your good with a multimeter you can check if juice is reaching the motor too.
------------------------------------------------------------------------
Now reloader B2 boards have the option of running off 4 or 6 battery packs. They can be picky about which they like. No idea why, mine prefers 4 packs !
Try a 4 pack if you have one or short the 6 pack with a bit of wire if you know how.
Does it work?
------------------------------------------------------------------------
If you think the wires are good and you are getting juice from the harness you may have a dead board. Ring Kee and get a new one or buy one off the forums, I'm selling a few ;-) .
If the board is powering on but spinning real slow try out the different battery packs if you can. This is a bizarre fix since they should run of either but hey try it anyway.
If the board is powering on but spinning slow change the boards settings.
You can enter the settings by turning the board on then quickly holding down the button again for a second when the orange light shows.
Find the manual online for your version.
A few here:
http://paintballsolutions.com/pdf/manuals/empire/reloaderb_manual.pdf
http://info.paintball.ru/files/manuals/loader/b2.pdf
You will be able to alter:
1 ) the speed the motor spins
2 ) the sensitivity of the microphone
3 ) spring tension monitoring
Max out the first two and set the latter to 1 (ON)
If after all the above you have exhausted my ideas.
Anyway I hope this helps you getting things up and running again.