It's been 10 weeks since I mailed my taxes but still haven't received my federal refund. I've checked the "where's my refund" page and shows nothing. Any suggestions?

If you didn't send your tax return with registered mail and the IRS doesn't have any information on their website, you should call them.  The phone number for the IRS is 1-800-829-1040.  Ask them if they want you to mail a second copy?