I used to work Tech support, so i have to many stories to tell about illeterate people, and my parents aren't any better. This is what happend the last time i was called in for help.
My dad used to be pretty good with Windows and computers in general, but he didn't keep track of new tech. So i got him up to speed about why we now use DVI instead of VGA and so on and so on. Since he does a bit of moviemaking and stuff i helped him pick out and build a new computer + the works (LCD screen, printer, etc)
Anyway, I got the new desktop installed and all worked fine. A few days later he comes to me with a problem he cant fix: Every time he booted his PC he got a black screen, but if he then reset/rebooted again everything worked fine. This only happend when he turned the computer completly off and then turn it on. It had me baffled a bit i must admit. So i punch up his VGA settings and see it's in dual screen mode, which is weird since he only had 1 monitor. I scratch my head for 5 minutes or so and then press the 'indentify screen' button to see what happens and i get this nice big 2 on screen. At this point im dumbfounded. So i activate which should be monitor 1 and find myself looking at an extended desktop background with no icons, taskbar ofcourse. Now i'm asking myself:
"how the hell does a computer with 1 monitor, go into dualscreen mode with only 1 monitor attached?"
Now if you figured it out allready, you are just as smart with PC's as me or better.
I asked my dad if he installed any other cables/hardware or programs after i left the machine last time. "no, ofcourse not." he says.
So on a hunch i turn off his PC wait 10 seconds and turn it back on, again im looking at a black screen. So i blindly type in his password and hit enter: now the extended desktop's background comes into view.
Now i look at my dad and scowl at him, pull the monitor towards me and unplug the VGA cable which he also hooked up NEXT TO THE DVI cable. problem fixed. I dont even wanna know anymore why he did such a retarded move and didn't ask. I rather fix then teach these days, the illeterate can't remember that stuff anyway.
I was also a bit angry at myself since i broke my first rule when it comes to computer hardware troubles
Rule number 1: Check the cables before anything else!