The OP stated that his other devices do operate on the 5ghz channel.

I haven't started the NAS replacement project yet. Just got back from camping now it's back to the regular work week. Thanks!

The network adapter in the computer must also be able to receive 2.4ghz and 5ghz. The network adapter in jeepers computer likely only supports 2.4ghz. It would be like trying to receive 100's of...