Nextbox wont switch ON

Hello everyone:
After 2 and a half months working flawlessly and great, today my Nextbox do not power up. All of the leds are off. I checked the power supply with my mobile phone and it works ok.
I pushed the reset button with a pin to no avail.
My Nextbox has no ext HDD attached, never had one, since I do the backup of my data in an external HDD connected to my computer USB, not Nextbox.
I’ve done nothing special or different from other days before.
It seems completely dead.
Please, help.