Ok lets get the pc booting first and then we can see if we can sort the log off user thing later
It sounds like he showed your dad how to reset the CMOS.
Its normally just moving a jumper from one position to the next.
There are 3 pins, connecting the centre and one end is the Normal Run position while connecting the centre and the pin at the opposite end is the Clear CMOS position.
I suspect that your dad hasnt set the jumper back in the run position correctly, thats why its giving you the message that the BIOS isnt installed.
What this has to do with static build up I havent a clue, sounds like he didnt know himself and was trying to confuse your dad with techno babble.
If you have an earth in your pc mains lead, unless its a laptop I have never seen one that didnt in the UK, then you cant get static build up as it would discharge through the earth :roll:
Anyway check the jumper, if your dad is not home now its usually but not always near to the CMOS battery, just check thats its connecting the centre and end pins correctly and if its still giving the bios not installed message set it in the other position and I think you will find that it will be ok again