New guy with 4x4 issue
 

Hi all.Just joined the site,it seems very informative,I hope to spend some time here,as I am a Suburban nut.
My issue however,is with my brothers Silverado.It's an 02 2500,with the pushbutton engaged 4 whl drive.We're in the middle of a pretty good blizzard,and his 4 wheel wont engage.He hits the button,the light blinks,he hears a couple clicks that he THINKS come from the switch,then it goes back to 2 high.Any common fixes?I checked the sticky up top,and saw there is a fairly common problem with the switch.Just wondering if our symptoms are the same?
Thanks in advance,Bobby.