Hello guys

First of all, sorry for my bad English. Well I have a problem with my stu-6. Yesterday it was mining normally, I turned it off for a few minutes and when I turned it on again (without touching and changing anything) it stopped working.
Now none of the 4 blue leds light, only the two yellow lights of the ethernet cable (and neither of them blinks, just light). The fans do work but as I say none of the 4 blue lights and no hash at all.

Someone could help me please? Thank you