I wouldn't be too worried. Try calling Dell Customer Care and they should be able to tell you.
I say don't be too worried because the same thing happened to me. I ordered a desktop on Monday night and didn't get any confirmation, acknowledgement, nothing. Didn't show up on their site either. So I call Dell Tuesday night and asked the sales person about it. She said that she didn't see any record of it, and that I should just reorder. So I reordered the same system on Tuesday night, as the coupons were going to expire soon. This afternoon, I still hadn't received any order confirmation emails or asknowledgement. So I called Customer Care and asked them about it. Gave them all of my information, and then they found both of the orders. Apparently either it took 48 hours for the orders to show up, or the sales person had no clue. But either way, the orders should be on their way.
Now I need to cancel one of them though, and the cancellation dept is closed.
