I think you guys go about business the wrong way, especially in how you think.
"I don't think that business will get you anywhere these days"... throw that out of your vocabulary. I didn't get where I am now because I felt I couldn't compete, that's the whole point of business is competing. I may have not been able to get them the best prices, but I made up for it with the best service, that was my strongest selling point. Just be positive about it, don't ever feel negative about it. Anything is possible, and it all starts with how you make it possible.
You would have to refer to your local countries law on fair trading and consumer guarantee. You must abide by the fair trading and consumer guarantee. So that's the level of support you'll have to live up to. Faulty goods etc, would most likely be solved with a return to base/manufacture/supplier warranty.
There's quite a lot involved. Since I feel you're only doing this as to make money under the table and not for a business, avoiding tax etc... Your support should be in terms of what your supplier offers as to which parts you used etc and how long they are covered for. You must abide by your warranty, or as M^E pointed out, you can strike up deals with other companies who can handle your support, you'll just be required to pay them a fee, etc.
Software issues do not need to be solved by you, and can be referred onto the support of that software vendor unless however, the computer never worked in the first place with the software.
As for hardware, they should return the machine to you, and you can either fix it yourself, or send the faulty parts back to the supplier/base/manufacturer for fixing, in which they can fix it or replace it with the same or equivalent. You can't however send the whole machine to them, unless you bought everything from them, so you will need to take part of the responsibility in fixing the machine yourself, at your own costs. Support is where a lot of money goes too and it's not a good thing for the company, so try to make sure you won't have to go down that line of giving support (impossible I know) but you're better off making sure everything is done to 120% or more when you've built those computers. It's a good thing that software is taken off your burden though, since just having that would get you tied down.
Cheers,
MC
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