
Have spent some time on the phone and (eventually) got an 'engineer' coming on Friday to replace motherboard and processor. Unfortunately couldn't get it sorted earlier, but at least it's free.

Hopefully I'll be back with a vengence early on Friday.
Oh, I hedged my bets early and took a high level cover - theoretically it matters not why any part breaks down.There's major research yet to be done into it but it seems to me that flogging your hardware 24/7 in the pursuit of human knowledge is bad for it and that PSUs and Mobos are especially likely to suffer in the quest for knowing.
Anyhoo confess ye not to any Boinc crimes and hold those retailers/manufactures liable for any manufacturer defects you can pin on them!
Good luck.