One of the burners on my kitchenaid cooktop will not heat up. What do you think the problem is? Is this something that can be easily repaired?

If it is not a glass top stove, with the power OFF, and cold, pull out a working element of the same diameter and install it where the non-working element was. Try it now. If it works, replace the heating element. If it does not, check for voltage at the element connector. CAREFULLY. Worst case is that the switch requires replacing.