My Flex 6500 works on my old laptop. It does not show up in my Smart SDR "Select Radio" Window. Tech support told me to turn off the dc to my radio. Re-boot my computer and wait until it was up and running and then open Smart SDR. What do I try next?
Are you connected to your computer directly or through a network? If you're going through a router, look to see that your radio is being seen by your network. You may want to try connecting your Ethernet cable directly from the radio to the computer if it isn't already to eliminate the network issues.
Once you have the radio working when it's connected directly, you can put it back on the network and troubleshoot until it comes up.