New or used? New, just return it.
Used? Depends where you bought it from. If you bought it from 'that well known auction site' you could return it if the seller advertised it as fully working. If you bought it from a trader (re-seller), most countries have trading standards that allow you to return a broken item unless it was sold specifically 'as seen' with no guarantee.
The circuitboard under the keybed probably needs a clean with IPA.
