I have just installed a new Eonon 7" 2 din am/fm/cd/dvd/gps unit in my truck. The only thing that works is the radio. Whenever you put in a cd or dvd it just reads no disc present on the screen. Anyone have any ideas on what could be the problem. I contacted Eonon customer support and they told me that since I don't have an order number from them they do not warranty it. I bought it on Ebay and they said it is not under warranty even though it was all new in the box unless I bought it from them direct. Any ideas appreciated.