I'm in my early 50s, been programming since a teen and got my A+ and Microsoft system admin certs not long after they first came out. About ten years ago I left

I'm in my early 50s, been programming since a teen and got my A+ and Microsoft system admin certs not long after they first came out. About ten years ago I left a partnership and was looking for work to make ends meet until I found the right job. Had an interview with a company for a tech/sysadmin type position. I was interviewed by a 20 something and one of their questions was how I would diagnose and repair a PC power supply problem. I said does the computer come on? No, I'd replace the power supply and get on to other things. She stopped me and started grilling me how I would know if the power supply is bad or not. I told her I could just look at the computer and tell, especially if it isn't powering on. She was getting a little upset and asked wouldn't I use a tester and check the other components, and I told her there's no need to get that involved when it's just a power supply. Needless to say I didn't get the job.