what to do

You didn't realise this was a possibility? You're looking for a quick and easy fix where there isn't one. I'd bet you money that it was a hardware problem that requires new parts/new system, both of which are the responsibility of the company you bought it from if you're under warranty.

Either throw the damn thing away and stop moaning on here, or bitch at the computer company who won't take it back. Either way, you seem to be ignoring the most rational advice in the thread (check Nicos Rex's posts).
 
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