Well, the PSU worked fine yesterday... and I've never had any issues with it at all. It's an Antec TrueBlue 480W.
It did power on last night... but stuck as I said. Today it won't power on at all. That's with and without the graphics card, IDE cables, SATA cables, PCI cards, memory. - It does power on if I connect the little bridge thing across the 20 pin thing - it's used so you can get your watercooling running without the board running. So from that it would appear the board is dead.
I can't be bothered waiting weeks while the board gets replaced...so...
I've gone and ordered a Fatal1ty motherboard, and a new PCI-E 6800 card, along with a new PSU. I was going to do this at some point anyway, but having a credit card and no PC makes you a bit shophappy
(When I say no PC I'm excluding this old heap I'm using just now as a backup)
Didn't take the DFI nf4 board because of the way it's laid out, there's no way the watercooling blocks will fit on that.
When the new kit arrives I'll have 2 of everything apart from CPU. So I'll be able to find out exactly what's bust and what isn't.
Edit : As for being gentle... yep I was, but after an hour spent trying to get the graphics block on... well, things happen
I think it's very unlikely that the guy sent me a dodgy board on purpose. He's got very good trust, and the board was sealed. It was an RMA, but when I took off the chipset cooler there was a little dust there, so it's been used at some point, sent back to MSI and they've refurbished it, or found it's fine - or just stuck it in a bag and sent it back out.
What I should have done was install the whole thing without watercooling, but that would have meant a whole lot more time - i.e. break it down, put it together, test it, break it down, put it together...
So for now I'll just break it down again completely, and wait on the new board coming, so I can hopefully just put it in and it'll work. I won't fit the graphics block until I know it's all working, because it's quite an operation.