Not sure what you mean. Have you already made an offer and it's not been responded to? If that's the case, I agree with one of my colleagues here. There's no "forcing" the banks to do anything. I do think it's a problem if it's a full price offer and has not been responded to. In most cases, if the house is listed with a real estate company, the contract will state that if a buyer comes along that meets all of the terms the seller has set out in the contract (price being one of them), then the seller is bound to move forward with the transaction.
So, I would question exactly what's going on here. And, give us a little more information to go on to advise you.
Let us know how it turns out, stacey017!