Won't fix it, or won't fix it for free?
Most businesses won't honor warranties on products from eBay, since no one selling on eBay is an authorized retailer. The people selling on eBay must've acquired the good from an authorized retailer at some point, and that's when the warranty period started.
Most warranty clauses disallow warranty transfers, and that's where companies get off voiding the warranty on secondhand goods. Some states do not allow that practice, however. You'd have to Google your consumer protection laws. Of course, that would only apply if the business had a presence in your state.