A PC isn't like a washing machine or oven etc..
It is as far as consumer law and courtrooms are concerned. Goods were purchased - they're not working as expected, therefore consumer rights apply, whether this is a customized high-end PC build, or a cheap laptop from a large retailer, or a washing machine.
The bottom line: If it doesn't work as advertised and expected, within 6 months of purchase, the consumer has a right to a free repair or a refund. That's the law, and it transcends any additional terms and conditions.
All I'm saying is, that if the bro returns it under warranty and it's due to something he's done, they're going to bill him 10% of whatever he paid for it, so best to make sure it's a genuine fault first.
The default position is that he hasn't done something to cause the fault, there's nothing in any of the OP's posts to suggest he's even tried to fix it, so we can assume it probably isn't a problem he's caused - unless of course he's lying, which none of us can verify.
As several people have posted, get him to sign up here and make a thread about what's happening, there are plenty of knowledgeable & helpful people on this forum who could probably help diagnose the issue pretty quickly - and either suggest a quick fix if it's minor issue, or advising what's most likely wrong with it, to help minimise any back-and-forth with the seller.
To be fair, the OP paid for a computer to be built for him, that would work - presumably because he didn't have the time or experience to do it himself, therefore it's
his right that he gets what he pays for.
Paying money for something, then being fobbed off with "
It just broke, someone else will be able to help me fix it online" is what these sorts of companies want people to do - cave in at the first sign of any resistance.
If the OP is telling the truth, and this is a case where it was broken from day one, and he hasn't done something silly which has caused the problem, he's well within his rights to complain.
Of course, If it was me - I'd try to fix it myself because I've built hundreds of machines, but if the OP doesn't want to - he has every right to send it back and repair / refund it.