Completely rewriting an original post so that the story is totally changed ought to be disabled somehow, maybe make it so only a certain percentage can be changed, anything else has to just be added on.
I think after a bit, many of us did understand the situation, that you have enough money to buy the machine, but you think you need your father to actually make the purchase for you. As has been pointed out, you don't actually need him to make the purchase on newegg. However even if you did, it is STILL dishonest and shows a total lack of good character to think that the solution is to damage, even temporarily, your family's computer, which YOU didn't have to earn and yet have had the luxury of using all these years, which your parents will then either need to pay to repair or replace (you haven't mentioned whether you're the only one who uses this computer).
No matter what the situation, it comes down to you being a whiny brat who thinks that anything is okay as long as you get what you want. Now that people have suggested temporary options to hurt the old PC, you say that'd be a good idea and want to look into it, but you still make it clear that you think if that doesn't work out you'll still try to physically damage it.
Your father is in the right here, it is HIS credit card, and even if it seems unreasonable, you live in his house and a new computer is a luxury that you don't have a natural born human right to. You are simply totally in the wrong in your basic proposition of how to resolve your situation. One must pity anybody who gets in your way in the future, since by then you may have actually gotten some power or money that makes it possible to get anything you want; maybe you'll make a good politician. Scratch that, you don't know how to keep what you're doing hidden, and you haven't got any ability to spin things to put them in a good light.