If you have an outdated computer, and you want to buy a new one, what will you do to the old one? Why not donate it to a charity center? Or maybe give it to someone who needs it more. Hmm... This is also a good deed. But please consider that you really give the computer in good condition otherwise the one who receives it will have to spend more money on the computer.
If you really want to do good deeds, do it wholeheartedly and completely according to your ability. Never leave problems to those who can't afford to solve. For example, if someone who receives your computer can't afford to buy a monitor, and you can't give him/her a computer. You'll probably need to consider whether to look for a second-hand monitor for him/her or else don't give it. Cause it will cause more problems. But if you really want to do good deeds, it's really not easy. Real good deeds need to be done truthfully and wholeheartedly.
