TBH I think a car is a very different matter to a PSU. A PSU is very much a disposable item that will quickly become cheaper to destroy and provide a refund / replacement.
A car isn't. Despite terrible often dangerous problems its very very rare for anyone to get a car replaced or refunded under SOGA, because fundamentally they rarely fail to meet most of the criteria for a car to be rejected as unfit for sale or not as described.
So to compare isnt really just, would you a resonable person expect to be without a less than 1 year old car for 8 weeks? No, by definition most people buy new cars as they see reliability as being much better, and would the consumer be put into undue hardship by a 8 week period, yes almost definately. A PSU, could you do without for 8 weeks, yes, very few people need as an absolute a PC, yes its a pain in the bottom, but you could do without it without significant issue.
I would just go to see him and talk to him face to face, if you explain face to face exactly what you need then your more likely to get what you want, its harder to say no face to face. But be reasonable, its esy to say no to something unreasonable.
If you can catch someone else in the shop, a prospective purchaser hes also more likely to accept something reasonable since it could affect another sale.
I have explained all this to them but they just don't see what we're trying to say. They're basically saying that we didn't have to buy another PSU, but who's wants to be without a computer for weeks when its not your fault?!
![[TW]Fox](/data/man-of-honor/2009.png){kind=avatar}