Is it possible to give back a used laptop (from private) for money?

So on normal Ebay. Bought it because I thought my old one couldn't be repaired anymore, but now it's fit again. I bought the structurally identical one on ebay on a suggested price and paid for it, it should arrive today or tomorrow. But I don't need you anymore. How do I get out of the number without losing money?

Is it a private or a commercial seller?

A private person. Just added the heading

You bought privately - there's NO right of withdrawal, exchange, nor voucher.

it's yours now, you've already paid for it.

Put that part back on and hope; that you get the amount.

How do I get out of the number without losing money?

Very easily:
You sell it again yourself.

Without goodwill from the (private) seller: Not at all.

By submitting a bid or a price proposal, you agree that you will pay for and (remove) the product. With private sales you will have bad cards. In the case of commercial customers, you have the option of revocation within the specified time.

You can still ask nicely if you can give it back and get your money back. But he probably won't.

But I don't need you anymore.

Returning a private sale because "I don't need it anymore" or "I changed my mind" is not a reason that the seller has to accept. You made a contract with him.

How do I get out of the number without losing money?

You can get out of the number again by reselling the laptop yourself at the best possible price. This is your problem now. You have to wait and see if you do not make a loss.