The other day I misdiagnosed a computer problem. It rarely happens to me but it does happen. I was working on a computer inside a large residential building that frequently call me as new residents move in and find they are unable to connect to the buildings free internet. This is what happened and this is how I dealt with a misdiagnosis.

When I arrived onsite to fix the network connectivity problems, I took one look at the lights on the back of the computer and it showed me that a proper connection wasn’t even being established instead of it being some sort of weird firewall or software bug that I often run into.

To troubleshoot this issue, I used my own cable between the wall socket and the computer to make sure that it wasn’t being caused by a faulty cable. I plugged one end of my cable into the wall socket and the other end into the client’s computer, no connection.
I then unplugged my cable from the clients computer and plugged it into my own laptop; again, no connection.

I went to the cupboard where the apartments networking patch panel was located and plugged my laptop straight into where the offices wall socket would go and I had no problems connecting to the network. After testing the cables in the cupboard with my own just to make sure there wasn’t a faulty cable on that end either, I had determined that the issue is faulty wiring between the patch panel in the cupboard and the wall mount in the office. I had seen many others issues like this in this building so faulty cabling was not uncommon.

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I closed everything back up, went down stairs and told my contact I had found that the issue is the wiring between the cupboard and the office and they need to send their guys (they have a special in-house team) who did the network wiring to come and fix it. Just after I said that my contact told me that she tried connecting her laptop into the same wall socket and it worked fine.
I asked her to bring her laptop up to the apartment with me so I could test it myself. We plugged her laptop into the wall jack in the office and as she said, it worked fine. I pulled the network cable out of her laptop and into mine and mine now worked when it didn’t before. I believe my mistake was that I didn’t push the cable in far enough when I plugged it into my laptop.

I plugged the network cable back into the clients computer that wasn’t getting the network lights originally and checked the BIOS and drivers to make sure that the network interface wasn’t disabled or improperly installed. I installed a new network card, plugged it into the buildings network and it worked immediately.

This was a misdiagnosis and my contact knows it. To make matters worse, this was one of my biggest clients as they call me out to their building multiple times a week so this client really mattered to me.
Anyway, this is what you should do when you make a misdiagnosis.

1. Apologize profusely
Most of the time, clients just want you to acknowledge that you screwed up and apologize for it. If you wish, you tell them in laymen’s terms why you misdiagnosed the problem but you need to be careful about how you say this because you don’t want it to sound like you are making excuses or are incompetent at your job.

2. Make it Right
Now that you have apologized, fix the problem and don’t charge them for the extra time or money it took for you to do so. Why should they have to pay for your mistake?

3. Offer a Discount for “Next Time”
Even though my clients said were fine with it, I told them that I would offer them a discount for “next time”. This helps establish that there actually will be a next time and makes them feel that you are truly apologetic.

I did these steps and am happy to report that they have called me in for more work since that event.