Yeah motherboards and RAM are actually the other things I was thinking of... RAM is probably a safe enough bet. I've had sticks die, but it's always been soon as I take them out of the pack and install, so probably manufacturing defects. I've never had a working stick stop working. Motherboard is also probably be fine I think, and I suppose CPU equally! Just be aware of course you won't have the warranty cover. Main things to avoid really are SSD and hard disk - you definitely want those new.