Is there any way to control external fans from my G5 DP2.7?

Hi there.
I'm building a silencing box for my Powermac G5 DP2.7 for use inside my home recording studio as the G5 is too loud for sucessfully recording instruments in the same room.
I have 4 slient blade fans. Two on the in-take and two on the out-take ports running at near silence. I'm very happy with the accoustic results of the silencing box. However, rather than having an external PSU for these fans, I'd like to power ,or simply switch an exteranl PSU, from the G5, so when it wakes up from sleep mode the external fans switch on. Likewise the fans shutdown when the G5 is in sleep mode or powered down.
The fans are 12V and draw a maximum of 200mA each. There are 4 in total, so the average drain on the PSU is considerably less than 1 Amp.
Any ideas?
Cheers
Glenn
G5 DP 2.7, G4 DP 1.25GHz, G4 Powerbook 550 Mac OS X (10.4.5)
G5 DP 2.7, G4 DP 1.25GHz, G4 Powerbook 550 Mac OS X (10.3.9)

You should check out this USB switch on flickr. The poster used USB power from his computer to turn on a relay. If you're comfortable with DIY projects, this should work for your silencing box.
http://www.flickr.com/photos/simplesimon/sets/72157594160190785/
PowerMac G5 Mac OS X (10.4.6) 1GB RAM, nvidia 6800 ultra, Apple 30" Cinema Display

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Message was edited by:
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