If you can run out to a fishing store (I know there is one on the corner of Jefferson/10 mile by you), try feeding him a medium-size earthworm (2-4 inches long). You don't have to cut it up either......it is soft enough where the turtle can bite it in half if he needs to.
Water temp still ok? You can raise it temporarily to 80 degrees if you need to.
Baby turts don't need much food (they have very tiny little stomachs!) so it is possible he is nibbling on stuff & you just aren't seeing it. Some turtles are nervous about eating in front of people at first because it makes them vulnerable to capture, etc.
I would not do any force feeding. Just gently continue to offer him food & take the time to hold the food there to him (don't just drop in and expect that he will eat it in 5 minutes.....try a longer period of time where you stand there....say, 20 minutes). Try the earthworms. I have never seen a turtle refuse an squigly, squirmy, slimy earthworm.
Let me know what happens after you try the earthworm. If he still won't eat it, I could be persuaded to possibly come over & check the little guy out for you!
Kristin