Actually it turns out there is an option to have the Aquaero emulate a USB keyboard and 'press' the 'power' key. Haven't tried it but it would rely on Windows being in a running state and given that this is a hypothetical emergency situation, I'm not sure that's necessarily a good assumption.
Regardless of which way you do it, you need the
relay connector plug which is Aquacomputer part number: 53080 and is currently in stock at OCUK
The Aqua computer ATX Break cable is part: 53047 but it seems to have two sets of wires broken out of the ATX power cable: a standby power (which only applies to the Aquaero 5, not 6) and the green wire which is looped. Essentially, they're tapping the wire in the ATX cable that you shove a
paperclip in when you want to power the PSU up without the motherboard attached. Given that, you could either tap your PSU's cable or buy something like
this and tap that.
So, two methods:
1. You
RTFM page 12 because the pinouts of the relay connector are, helpfully, reversed between the Aquaero 5 and 6. Then you connect the normally open and the common pins of the relay to the motherboard's power switch connection in parallel with the case's power switch. You might want a
2-pin extension (also good for temp probe extensions and available from OCUK in a variety of colours
) to do this and it will involve a bit of soldering as I'm not aware of a 2-pin splitter off the shelf. Then you set the emergency alarm action to close the relay for 10 secs and it executes a forced shutdown (regardless of Windows state) in the same way that holding down the power button would.
2. You tap the ATX "PS_ON" wire which is pin 16 and wire that through the relay on the Aquaero using the normally closed and common connectors. The alarm action then is to open the relay. This turns the PSU off in the same way that taking the paperclip out does. This is probably the most failsafe way of doing it simply because it directly tells the PSU to turn off whereas option 1 tells the motherboard to tell the PSU to turn off. Should the motherboard already be knackered, it's conceivable that it would fail to do so.
I should point out that I haven't tried either of these but from what I've read on the Aqua Computer forums, the manuals etc it should work. I'd advise you to do your own research to check though - not that I think I'm wrong...but I'm definitely not responsible