Scanning, Faxing & Copying

I just purchased this OfficeJet Pro 9025e all-in-one printer.  Since it does not come with a manual, i'm having to figure this out on my own.  I'm trying to use the automatic feeder to scan documents.  I've verified that the feeder works - I placed a document in the feeder try, selected "copy" on the screen, and the document feeds through and then prints a copy.  However, when I put a document in the feeder, and then go through the selections to scan it to my computer, you hear the scanner engage, with the document still sitting in the feeder, and then a few seconds later, a blank white sheet pops up on my computer.  I try pushing on the document, thinking maybe it needs help to "grab" it, but nothing.  The feeder obviously works, as it works for copying, but why will it not work for scanning?