In relation to #6717, I have my own tale of idiotic computer repair shops.
One day I lose my default resolution on my desktop computer. All I'm getting is 640x480 resolution and shitty colors and no ability to change these settings. I try to troubleshoot and take a hard drive out of another computer and boot it up on the broken computer with the same results. I don't know much about computers at this time, so I figure my only course of action is to go to a repair shop. Nevertheless, I'm pretty sure this is a hardware problem, not software.
The repair shop evaluates it then tells me I have a virus and they'll gladly remove it for $100.
"That doesn't make sense. A virus is a software problem, but when I put in a hard drive from another computer, the same thing happened."
"Well, you must have the same virus on the other computer."
"But the other computer works perfectly fine."
"It could still have the virus."
"Ok... forget the virus. I don't think it's a virus. What else could be wrong with it?"
"There is nothing else wrong with it. I ran a diagnostic and your computer has a virus."
"But it doesn't make sense that it would be a virus."
"Look, I have a business to run here. I'm not going to let you con me, using me for free evaluation purposes just so you can take the computer and have someone else fix it! If you don't want me to fix your computer, just let me fix it and stop wasting my time!" he finally says angrily.
I was so shocked I just picked up my computer and left dumbfounded. Later I diagnosed that my graphics card had bit the dust. I bought a new one, and voila, computer worked perfectly fine.
Now that I know computer repair extremely well, I'm still dumbfounded at that supposed computer repair "professional". He couldn't diagnose a faulty graphics card? That is such an obvious potential cause to the problem, and not a virus!