I tried the collies lead (geddit?) and didn't feel to get anywhere. The folks there were saying they couldn't get into the BIOS settings - I can get in, can see the clock ticking away at what it believes to be the correct time (hrs:mins:seconds)...then the seconds stop clicking and all contact is lost - no mouse, no keyboard actions. Nuth'n.
If I then restart, it kicks off again, having timeshifted to where it believes the time is now - so that would suggest that the mobo battery is OK. It is *keeping time*...it just freezes and stops showing a time count.
I'd be amazed if it does run hot after the build. It has three case fans and a liquid cooled heatsink the size of Blackpool Tower.