How do you buy songs on iTunes when you account doesn't have money?
Put your credit card number in iTunes. ------------------ Or use a gift card to top up your account balance
You purchased songs from itunes they are on your old computer that just would not turn on you still have your itunes account is it possible to retrieve them?
If you mean the same iTunes account, then yes. My sister has the same account on iTunes on our home computer as well as her laptop. But if you buy some songs from the iTunes store from one of the computers and you want the new ones on your other computers, you'll have to sync those songs into the other computers' iTunes.