If only one device works, try power-cycling the hub by unplugging it for 10 seconds.
Ensure the adapter matches the required voltage (check the bottom of the hub). Linksys Network Hub Nh1005 Manual Pdf txt
Are you trying to connect this hub to a or just between two older computers? EtherFast® 10/100 Workgroup Hubs - Linksys If only one device works, try power-cycling the