I have a 2002 chevy S10 4x4 pickup. My problem is that when i push the button on the dash to engage the four wheel drive, both drive shafts are turning but the front wheels are not. do you have any ide the problem?

Front axle actuator

The front axles turn all the time in or out of 4x4 unless you have lockout hubs,,, it may not be in 4x4 ,,,jack up the front end,, use jack stands please,,,,leave in park put in 4x4 and see if u can turn the front tires,,,if you can it could several things,,, front end torn up,,tranfer case bad, shifter soliniod on front axle not engaging,, or the button in the dash is bad,,, it most likely the electric 4x4 switch or the accuator on the front axle is not working,,

2002 chevy s10 4 door 4x4 4 wheel drive wont engage