Well, I'm an 18 month newbie in crypto, and I got started first with USB miners, then a few Butterfly Labs 700Gh miners, then moved on to various Antminers.

What a learning curve.

So I have a lot of 'retired' miners (and PSUs).  I sold an S3 to a neighbor, and he can't get it running.  Everytime he brings it back to my network, the miner boots fine an runs @ full hash rate.  At his house, the miner boots (access via 192.168.1.99) but the red light stays on, and refuses to fully boot and mine.  It show 0-0-0 in mining status, yet you can access other features (reboot, other menu items) as expected.

My ISP is Charter (local cable) Internet.  His ISP is ATT.

This is a mystery where I need Geek friends.  Suggestions to get this S3 (and future upgrades) up and running are welcome.