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retailer for the first year, then manufacturer (/UK distributor) for the remainder of warranty is the norm, unless the retailer has some special arrangement (as it's not from here, I'd guess not!)
found this, which doesn't really clear it up at all:
http://uk.msi.com/page/warranty#w-vga
When I had to RMA a motherboard I sent it to ocuk who then sent it to MSI. This was about 18 months after purchase.
don't bother emailing MSI they are useless in my eperience, try and get the reseller to sort it
From start to finish, how long did it take?