My pup has drive like this as well, I've tried so many things with him it would probably be less trouble to sell him and buy a new dog...however I would never forgive myself if I did such a cheap thing, which is why I'm holding on to him for dear life. Right now he is 6.5 months.
I've done the crate thing as well. He will stay for most of the day in the crate before I take him out to do drive work, and then back in the crate. Like they said, it doesn't 'create' drive, but at least you can rule out exhaustion on why the dog isn't working. <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />
What I do is I take him from the crate straight to the front yard or the field (which is right beside our house <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />
. At this point he'll be more interested in sniffing or playing. I make sure he's on a long leash then I leave him alone. I walk around playing with the ball/tug by myself and ignore him (no eye contact, no calling him, etc.) After a while he gets bored on his own and will start to play with me, in which case I start to intensify the action. I only take one tiny step from what we did last time before I take him back home and in a crate (i.e. no bites before, one bite now then put away...etc.) If I have someone with me we also throw the toys back and forth between ourselves, or run around chasing each other until the pup realizes how much fun he's missing out on if he doesn't join.
Another thing I try is to take my older dog, who'll ignore the pup while playing ball even if the pup wants to play with her. Then I play ball with her. The pup is first on a leash while he gets excited, he just wants to play with the older dog first. Then we let him go, he'll run up and try to play with her...she ignores him and keeps on playing ball with me. After a while the pup sees what we're doing, if he shows interest in chasing the ball and not my older dog, I throw the ball, and hold my other dog back while the pup chases the ball. Once he grabs it I praise him wildly and play tug with him/run him/etc. A couple times of this then we hold the pup back again and let him watch the other dog one or two more times, then it's back to the crate.
"Frustration builds drive" is what people are always telling me, so I keep this in mind. However I also learned you have to let the dog know how success feels like at first, so that there will be frustration in the end when he stops having so much success. So when playing tug it may be 'miss' then 'bite', then 'miss miss bite', etc. I was doing so many misses before I actually ended up making him lose interest...now I don't do that...oftentimes the first bite is an easy bite...then I make him work harder for it.
Only time will tell if these things can peak his drive, he is improving now, as before he had absolute zero interest in anything outside the house. The reason I stick with him is because he's a great dog on every other aspect, one hell of a tracker, with a really hard temperament to boot...plus in a room with no distractions he is quite drivey and gets really frustrated if he can't get the item (to the point of biting me), so I know he's 'hiding' something underneath. I just hope I'm not proven wrong. <img src="/ubbthreads/images/graemlins/grin.gif" alt="" /> Oh well...at least all this stuff is helping *me* learn.