When playing with Old MoBo.. a **** load of mixed ram modules helps in fault finding..( but be careful if mixxing in a machine)
Hi Undies, I have actually used the technique to violate a large corporate's BIOS/CMOS custom security

It would not let me replace a hardware device so I gave it a bit of a "shock" and it re-assessed itself, adding the new device...........yes...........I got it to accept a thumb drive as well

Errrr................nothing illegal, my mate's wife had got the machine from work when they were doing a hardware upgrade...........it just had custom BIOS that prevented new devices being added...........all I had to do was provoke it into looking at what was actually attached?

Cheers