I was using SM w/ my Nikon last night, suddenly Server INDI lost connection and I noticed SM was completely dead, no video signal, no green light, just red light. No System reboot , nothing.

Is there any reset button inside PI?

Which steps should I take?

(I removed SD card , returned it again, but no reponse)

Red light means, that power is connected. After connecting power, the green light must blink for some seconds, what means booting. Without booting no video-output. If the green light doesn´t flash, you can have a problem with the sd-card. I would flash another sd-card with SM or ubuntumate or raspian and test booting with this sd-card.

Thank you!

I opened a support ticket, waiting reply. But it seems an SD card issue. I tested Sd card inserting into a pc, and it was not recognized.

unhappily support does not yet replied to me ( I suppose that because it was bought in OPT site, but camon....).

The SM was bought in the OPT shop ,that time there was no products in stock SM shop.
So now OPT shop asked me to return back the unity, but I tried to explain that I just needed a new one card or a link to download the system, whatever.. I don't care buying a new one SD card..

I live in Brazil and will take an eternity to receive it back. And as I read OPT do not send to my country, so it will have to be sent to my nephew in NY, and then he send to me ..Can Image all the mess.. Of course, if is just a matter of SD card burning a new one system it is far simpler than all those gymnastics!! Really, I m very disappointed.