I have a major problem and need troubleshooting help! Today all 3 of my 1TH/s miners stopped working. 
One stopped working after mining non-stop for a couple of weeks (it was left alone and untouched) so it couldn't of been hit at all. I turned it off and back on, nothing. I ordered a total of 3 from batch one and today all 3 stopped working after i turned them off and back on! all i did was power down and turn them back on & the screen just displays a dark blue square, a red light & the fans always run full blast, I cant even see them on my network. I find it strange that all 3 decided to kick the bucket on the same day. Should I RMA all 3 i'm not sure what to do.
One stopped working after mining non-stop for a couple of weeks (it was left alone and untouched) so it couldn't of been hit at all. I turned it off and back on, nothing. I ordered a total of 3 from batch one and today all 3 stopped working after i turned them off and back on! all i did was power down and turn them back on & the screen just displays a dark blue square, a red light & the fans always run full blast, I cant even see them on my network. I find it strange that all 3 decided to kick the bucket on the same day. Should I RMA all 3 i'm not sure what to do.you might just be the only batch 1 owner who has not yet had to deal with this issue. I think everyone deals with it sooner or later.
don't try to RMA your miners - they are not busted.
read back 20 pages or so, and you'll see discussions of these two problems:
-power supply stuck off. it happens because the power supply has a piece of wire shorting two pins to force it to turn on and stay on all the time. when you kill the power, it refuses to power on again for about 5 minutes. just wait.
-SD card corrupt. this one is more of a pain in the ass. you have to remove it, reflash it and reinstall it. again, detailed directions on how to do so further back in this thread. but don't bother resorting to this until you've tried turning it off and on again (with 5 mins in between) at least 5 times. it might just boot up on it's own.