I think you should contact your dealer or DMM suport directly and ask for repair or replacement. There seems to be something severely wrong with the hardware.
DM800HD se V2 "2nd failed!"
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Maybe is problem with power adapter?
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dm52x are very cheap nowadays
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if it's possible, try another Power Supply: 12V, at least 3A
Without an internal HDD the power supply of an external harddisk drive could work (typical: 12V, 2A), but pay attention to the polarity of the plug!
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if it's possible, try another Power Supply: 12V, at least 3A
I tried with an identical power supply with identical results…
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dm52x are very cheap nowadays
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I think @gutemine meant that a dm520hd or dm525hd could be a cheap replacement for your broken dm800SE v2, if it is outside the warranty. If not, create a ticket: http://rma.dream-multimedia-tv.de/RMA/
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In the first post he writes that the 800se v2 is one month old