I get no amber indicator lamps on my shifter buttons. won't shift to 4wd. on 2004 Chevrolet Silverado 1500

It seems to be locked into 2wd and can't shift when buttons are pushed.

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2 answers
check your fuse, relay, and connectors at shift button or transfer case and actuator . No lights indicate a loss of power at the shift button terminal...
maybe the actuator or fuse is not working.