Answer:
Compliment the client on his knowledge.
Ask the client to backtrack to see what things he tried in order to fix the computer.
Check the simple things first to make sure you do not miss anything.
Explanation:
First of all Jerry will commend the client for his knowledge and attempts to fix the issues, then to get an idea of of steps taken by the client, back track through all he did with a view of correction any misstep.
A preliminary check of basic issues that can be causing the problem is also carried out.