So this is what I have going on with the Antminer S4. When I power it up it turns on and the fans start turning on full speed and the LED screen lights up. However nothing is displayed on the screen and the two small LED lights to the side never light up. It runs like this until I cut it off....... As a side note I have two antminer S4's only one is doing this, the other works fine. If I switch the SD card from one miner to the other the one that is working continues to work and the one that is not working will not work no matter which SD card is in it. PLEAS HELP......after posting this and reading it the thought accord to me that what I should do is just flash the new OS to my SD card with the miner that is working. Sure enough it works
Sometimes it dose a lot of good to right your problems down. Hopefully if any one else is experiencing this problem this post will help them.