Don't know what I was thinking, but I disconnected by WD external hard drive that I use for time machine without properly ejecting it from iMac. Now when I try to reconnect, iMac and TimeMachine do not see any drive connected. Anyone able to help?
I found another discussion that basically said to shutdown and unplug mac and the HD for a few minutes and the plug in and reconnect everything. Actually worked. Time Machine reconnected like my little problem never happened in the first place. Thank you to those who replied.