Those 0% deals are very tricky...a case to definitely make sure you "read the fine print". There's variables in them which can make that 0% much more expensive than buying outright, or possibly even an 8% loan. Say for instance you missed one payment, they will jack you up to a 20+% interest rate and make you pay back-interest from day one of the loan, not including any fees they may charge. The gist of that is you just payed a whole lot more for your laptop/computer.
"But I'll never miss a payment!" you say. What if you get injured on the job, in an accident outside of work, become sick, loose your job, or a natural disaster hits. You'll have more important things to worry about than paying for that computer.
Part of the issue we have here in the US is our people's ability and acceptability to live in constant debt. It's an issue which is going to come back and haunt us soon. I'm not saying all debt is bad...some like a mortgage on a house or other real estate is definitely acceptable. However, financing whimsical things like a computer or other non-essential small ticket items (TVs, audio systems, furniture) is a bad trend that's only getting worse. You're much better off saving for a few months and buying outright.
If you can't afford it, why are you buying it? I could see, if there were no hidden fees or a raise in price, someone financing one if they already had the means (say maybe had the money in a good interest bearing account of some type). That makes sense...but digging yourself into a hole and not being able to get out of it, especially on something that depreciates so rapidly, doesn't.