Unless you replaced your old column with one from an exact vehicle, you're going to find it difficult to resolve a no crank concern.
Clearly there must be an application issue, or perhaps the new column has a fault, or had an installation concern.
RepairPal Certified shops can diagnose and repair your 2012 Chevrolet Silverado 2500 HD. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.