IMO, best way without actually having to break valuable hardware (which can at the very least be recycled for the raw materials) and getting a new computer while maintaining good family relationships (which I assume you want, especially if your family is rich) is to pile up a list of every single issue that even remotely has anything to do with the computer and then preach the list to your parents endlessly for a few days/weeks, with particular emphasis on why getting a new computer is also good for
them.
E.g. if you use the computer a lot, then you could say that upon the purchase of a new computer, your father/rest of family will be able to freely use the old computer anytime they wish, and you can pledge to clean out/format the computer to get rid of your own data, therefore retaining the old computer and acquiring a new one. This reason for getting a new machine is super effective when dealing with larger families or families that heavily rely on the computer.
Since your family is rich and you appear to have shown a weakness in your father's character, you can appeal to both; all you need is good, valid reasoning; a sprinkle of positive, persistent, pestering preaching; and some faith in trust. IMO, faith in trust and the family is super effective when dealing with Oriental/Eastern families (first-hand experience
).
Appeal to the family's wealth and stinginess: argue that for the benefits of the computer, it's very cost-efficient. Turn it into a "learning experience" by pledging that you'll find your own computer and that all your parents need to do is fork over cash at the register. Alternative is to pledge that you'll find the parts and build the computer and that you want to learn how to build computers (and I'm sure you'll enjoy doing so, the insides of the machine are fascinating).
Key points:
-Cost-effective.
-Learning experience.
-All your parents have to do is verify the computer and provide financial support (no effort required on their part).
Appeal to your father's (apparent) selfishness: getting a new computer will effectively remove you from the old machine, leaving your other family the machine. Based on what each individual family member's needs are, preach to them.
E.g. your father does not require a new computer to enjoy his games and use e-mail services. By buying you a new computer, he will have the machine all to himself, and neither of you will have to pester the other to use a computer ever again (also apply for larger families, but if you have younger siblings, you DEFINITELY need to provide breathing space for "ownership" of the different computers, if you believe in such a thing; it'll be unnecessary Hell otherwise).
Furthermore, you should promise and actually clean out your old computer.
Key points:
-Appeal to others' needs, not your own.
-Your family can freely use two computers at any time they require (effective when dealing with both large and small families).
-Provide maintenance for the old computer in exchange for a new machine. If you're doing this, make sure your parents know WHY you are doing this and that you're doing it at all. Obligation is powerful.
Appeal to others' wishes for yourself: I'm sure your parents want you to be a success. Make them aware that you need this new computer for (SCHOOL)WORK. Sincerely do some homework, and then when the computer starts doing anything at all to impede your progress, SCREAM like your machine is possessed and is actively trying to destroy your work or something. Proceed to add this issue to the list of extra reasons why your family needs a new computer.
Remember, turn this issue into something that when solved, will provide everybody with benefits.
Key points:
-The old computer is impeding progress of work.
-Your family needs the new computer; not just you. E.g. in case your parents ever want to use new software or such.
Last step: preaching with persistence. Every single chance you get, make everyone in your household aware that the family as a whole needs a new computer. THE COMPUTER ATE UP MY HOMEWORK; I WON'T BE ABLE TO GRADUATE, GET A GOOD JOB AND A GIRLFRIEND, AND EXTEND THE FAMILY LINE (alternatively: I WON'T BE ABLE TO GET RICH AND HELP MY PARENTS LATER IN LIFE (((I.E. WHEN THEY GET OLD)))).
Ideas for things to preach about:
-OH MY GOD THE INTERNET JUST DIED
-OH MY GOD I WANT A NEW COMPUTER
-OH MY GOD WHY ARE YOU ON THE COMPUTER WHEN I NEED IT FOR WORK
-OH MY GOD I WAS ALMOST FINISHED MY WORK WHEN THE COMPUTER DIED
-OH MY GOD wow hey, this new computer here that I found on [big-box store]'s website is so much better for [a shitload of tiny reasons]
-OH MY GOD hey, I'll fix up the current computer if we get a new one, so I won't need to bother you anymore for a new one
Using this method of persistence and turning every factor into
benefits, you'll get a new computer in some time, but you'll keep a whole lot of shit that you definitely don't want to throw away.
Also, you'll be doing good for the environment since you won't have to break the computer (add this to your list of things to preach about, or something similar about the environment).
PROTIPS:-Practise patience. Good things will come as long as you keep at this.
-Practise moderation. Don't become a nuisance with your preaching; take the opportunity when it presents itself, don't go overboard.
-Don't move the centre of benefits to solely yourself; keep it with the family or your dad (better yet, both parties).
-Preach the good, belittle the bad.
If you play your cards right, you will doubtless achieve your goal without unnecessary loss.
FINAL PROTIP:Follow the wisdom of the Eldar. The future has already been determined; all that needs to be done now is to choose and follow the path that leads to the future you desire.
Pick the future you want with the rest of the universe in perspective, and move your pieces to their respective positions to get the result that you want. Ez.
If you follow my advice and it fails, sorry -- I guess you don't have my foresight.
if you've made it this far without averting your eyes from the wall of text, I applaud you; this really may be the way to go for you ;oP.S.IMO, all of the other ideas presented thus far are, to be frank, bad when put into perspective. Risky (frying hardware, your father's not stupid), dangerous (frying hardware, you might get disowned (joke)), wasteful (frying hardware, throwing away a perfectly fine machine), harmful (frying hardware, environmental reasons), pointless (doing nothing when the situation has so much potential for benefit), etc.
If you follow my plan, especially with a grain of salt, and your own judgement, I'm pretty sure you'll get what you want (or better, if you provide ample pressure to actually push your own parents into WANTING to buy a new machine) with little to no loss whatsoever.
Seriously, I could preach more and more about my plan until I'm dead. If you want any further help, I can probably provide it. Of course, this plan only works based on many assumptions I had to make about your life, so it might not be entirely reliable ;o (which is why I stress that you need your own judgement, unless you don't mind providing me with further details so that I can flesh out your scenario; e-mail, PM, IM, are all means of communication with me).
Depending on various factors, the amount of time that you'll have to invest will vary significantly. In the wise words of TVTropes, "YOUR MILEAGE MAY VARY."