Yes, Gigabyte accepts eBay invoices as proof of purchase.
Yes, Gigabyte accepts eBay invoices as proof of purchase.
Used boards aren't covered by warranty for most suppliers. The only company that handled warranty issues was EVGA; other board makers don't usually offer this unless mentioned. Gigabyte support typically advises you to either pay for the board to be shipped and returned after a month or accept that they won't fix it without a refund, or you might just purchase another one.
In Europe, the guarantee covers all individuals, but if you have a valid receipt, it remains active regardless of ownership changes. In the US, according to my understanding, the warranty mainly applies to the initial owner, which seems problematic. Ebay functions more like a marketplace than a retail store.