170 please don't confuse the situation.

The mobo is grounded to the case so him grounding himself should be a non issue. Denholm you probably did not nuke the system. Most processors will not boot(post) if you have overclocked too high and will definitely not boot if messed up a setting. Usually a CMOS reset will solve the problem. LOL, when I originally overclocked my cpu, I had to reset CMOS many times till I got it perfect. My old Athalon needed just a battery pull and reinstall. Newer Mobos have a jumper. I can reset my CMOS with no light I did it so many times when I o'cd.
To properly reset CMOS follow these instructions.
Turn off computer and unplug.
Uninstall Battery
Next is important. There will be a "jumper" that is on 2 pins of a 3 pin config on the mobo. You need to switch the jumper to the opposite pins.This will ground out the mobo.
Next move the jumper to original position.
Re-install battery.
Plug-er in-get-r-done
Here is an illustration of pin config
JUMPER ON 2 BOLD DOTS(original config)
V V
. . .
JUMPER MOVED TO GROUND MOBO
V V
.
. . JUMPER BACK TO ORIGINAL CONFIG
V V
. . .

There are 3 pins in this illustration. The jumper is over 2 in the original config.
Let us know how you did!!! GL
Death