need help vantage hd8000s

hi
hope someone can help i have the vantage hd8000s all was well til a week ago then it came on for 10 seconds
then tried to re-boot but went off now all it does is say booting but it dont boot
i thought maybe it tried to update itself i am not sure i build my own computers but have not got a clue about tring to fix it
would appreciate anyones help even if to say its knackered buy a new one
cheers









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