Will i get banned?

If I cheat on a second computer, will I get a ban on the main one?

Seriously?

yes if it's the same account

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and don't play with an account on a computer who get a ban

I dont think so

You can make a seperate account for each different PC, but osu! rules suggest it's 1 account per person, so you'd have to pretend to be your own brother or something.