Just received my Flex 6600M. The box was excellent condition. I unpacked the radio read through the Quick Start guide, check my 13.8 volt supply voltage and power up the radio without an antenna connected and without an Ethernet cable connected. Much to my surprise It started making a fairly loud noise as the fan spun up. Much like a cable s rubbing on the fan blades. SO how would Flex like to proceed with this issue. Please advise, I don't want to take a chance of voiding the warranty.