My experiences confirms msfixit statements. I also ran a computer business on the side rather than take a local computer job for a menial wage, but shut it down to pursue teaching computers. I have 2o+ years of military computer experience and got aC.S. degree after the military. After teaching six years, I was let go and discovered that technology had blown past me. I moved to "HOT" Atlanta because there I could make three times the wage for the same effort. Certifications open the employer's door, but theory alone makes no one an expert in any system. I am reminded of the medical profession were in the begining most doctors were general practicioners; today most are specialized. Find your field, get certified, become an expert, but diversify your income sources.