Lazy! It's basically a contract dispute. The customer contracted with a person to supply to them a custom build. The build quality was very poor (see the pics) Basically anyone selling in the course of a business must use ' reasonable care and skill' and provide a product that is 'fit for purpose'. It is quite clear to me that the PC supplied was built by a n00b. It looks awful and despite it actually working, it is put together is such a shoddy fashion that you have to wonder how long it would last? If there is no written contract then the terms of the contract are what was agreed expressly, or verbally between the parties. If emails were traded then there could be agreed terms in writing also. The buyer is entitled to repudiate the contract and demand a replacement or a full refund if the item is not fit for purpose. If it goes to court the winning party will also claim interest as well as damages. If the buyer claims then the heads of claim will be in Contract and Negligence.