Have a GS724T on the network. Cannot find it via default IP, does not show up on the smart control

[X78rd]

Have a GS724T on the network. Cannot find it via default IP, does not show up on the smart control tool. 
I cant find it via ARP. 
How do I connect to this thing? I inherited it and its all set up - I dont know how its set up so I CANNOT factory reset it.

Any advice would be appreciated. 

[plemans]

Not sure why you can't factory reset it. 

If you don't know how its setup, starting back at factory is a reasonable option. 

[schumaku]

Switch models with the GS724T designations exist for about 20 years.

The configuration could prohibit almost anything - discovery, network access, management UI access e.g. on select ports or VLANs only, and much more. Send a crystal ball.

[X78rd]

Understood. I guess I have no choice. Thanks for the input!