... The guy asked how to do something, not whether or not he should do it...and yet the vast majority of responses skipped over his question and elected to answer (without being asked) the latter question. That's kind of annoying.
The thing is, the guy admitted two key things:
1. He has no stable income with which to pay for the laptop himself.
2. His father already has bad credit.
The reason why it makes complete sense to urge the OP to wait and not go into further debt for a laptop is that the kind of financing a person with no income and bad credit can get, is the kind I would not wish on my worst enemies. You will be hard pressed to find a 0% offer when you have no income and bad credit, you'd probably be looking at 20% or more. It's the irony of this world that people who need the money the most, have to pay the most to get (via high interest rates), while people who are well off can get tens of thousands of dollars with 0-1% interest and re-invest it to increase their wealth further.
That Apple financing page that someone posted above states your interest rate would be 23-27%. Why in the world would you want to pay that much? It's insane and will look reasonable only to people who are really bad with math. If it was 0% I'd be like, sure, I can take the $2K I was gonna pay for the laptop and put it into a savings account that pays 2% and pocket the difference. But it makes no sense at those kinds of rates.
So in theory, one can get financing and maybe they will offer you a loan at 27%. But it would be stupid to take that "deal", unless you can have extraordinary circumstances that necessitate you get that laptop at any cost.