Maybe someone out here can give me some suggestions that I haven't tried yet.
All my miners S3. and 4 S3+ all stopped working at the same time. I can't remember what lead to it, but they all started chirping in unison beep beep beep non stop until I turned the power off or whatever I did, I forget, (I have been up 28 hours, and memory is getting foggy on what the specifics of the bomb was)
They power up, look to connect, green flickers yellow is on as well no red led's unless I am just turning power on. They are/were/are again on powerline internet. I swapped out a range extender which worked perfectly in my sons garbage pail of a bedroom

.
I can not get into them, they are not connecting to Slush or any of the fail-over pools. The fans are almost idle. They aren't hashing obviously. but the internet is there.
I can not log into any of them. I had ending IP's from 94-98 used, always leaving 99 open for a new unit should one appear at the door one day.
Is there a hard reset, and if so, exactly how do I do it? I know there is a pin hole, beside the Ethernet port somewhere i stuck a thin nail in one of them, but it didn't seem to do anything.
Any help is greatly appreciated, going on 18 hours downtime now no hashing.
Thanks in advance.