If you were approved for a loan with a down payment then there is an expectation you will have a downpayment. There are very few loans with 100% financing these days. There is an expectation that you will provide a deposit with your offer but no more than 3% of the sales price. The deposit is held uncashed until both parties have acceptance. In this case the sellers lender (s) will need to approve of the sale. Once they have approved or if they do, then escrow is opened and everyone moves forward. Hope this helps a bit.