I'm sorry, but you're wrong. The Sales of Goods Act states that the person you have the contract with is responsible in the first instance.
Within a "reasonable time" you can reject the goods as not of satisfactory quality/not fit for purpose. This is normally taken to be 28 days.
From 28 days until 6 months the retailed (NOT manufacturer) has to prove the defect was not inherrent when the item was bought (i.e. you've caused the problem yourself). After that, the retailer is STILL responsible, however, you have to prove it was an inherrent fault (not impossible, I managed to do this with a monitor after 2 and a bit years of owning it, getting a full refund in the process).
If the retailer tries to fob you off to the manufacturer, stand your ground - it's their job to fix any problem as you have a contract of sale with them. Repairs must also be undertaken in a reasonable time, so anything over 28 days (this is Acer we're talking about, the people who required 3 months to "fix" a monitor I sent in) and you may have a case to argue for a replacement from the retailer.
So to the end user. If its under 28 days take it back and insist on a replacement. If its over 28 days do not expect a replacement you will not get it unless you are extremly lucky. You will ofcourse be entitled to a repair but the repair will be done by acer. You can either arrange this via the shop (if you don't want the hassle of phoning acer yourself) or via acer direct (if you don't want the hassle of going back to the shop)
So, the OP should take it to the retailer and state that it has an inherrent design flaw and they wish for them to offer a repair or replacement and not to take no for an answer (can be a pain as even store managers seem to not know, or claim not to know, the law). If you run into problems the nice people over at ConsumerActionGroup are very knowledgable and will no doubt be able to help (form letters, relevant sections of legislation to quote etc. etc.)