I noticed some green residue on the motherboard you purchased.
I noticed some green residue on the motherboard you purchased.
The green substance you noticed is likely a residue or cleaning agent left after soldering. It’s common when working with motherboards. As for the warranty, it depends on the seller and the product; check the terms to see if it’s covered.
It seems the corrosion was likely due to a small amount of water.
When purchasing used items, I wouldn't rely on a warranty. If you need the original equipment manufacturer (OEM), chances are you'll have issues without an authorized sales receipt. Otherwise, they tend to create trouble for buyers. Usually, I approach things by checking if it's a good deal and whether it functions properly right away.