Not my mistake but,
Back in the day, my first rig bought 2nd hand off a guy who lectured at leeds met, cyrix p150+,
Now I was a pc 1st timer, this thing was a monster to me,
My cousin who arranged the buy and brought over the PC also brought a isa 14400 modem.
He tried for about 6 hours to get this modem to connect to his demon account, then gave up and went home.
I had told him, I saw a message about it needing to re-boot after he put the drivers on, he was having none of it, a pc noob telling him something need doing.
I rebooted it and went and grabbed a cold one from the fridge, starts the demon software and discovered the internet!.
He hated me for it.
He told me never to open the case, it was all too complicated inside, he had took years learning before he built his own or anything, a mortal such as me who had only just got a pc had no right to tinker.
And after a week I had rebuilt the whole thing, put in 64mb of edo, got all the front pannel lights working, hdd ect and popped in a 3d card.
I still give him a dig about it now.