Mac Pro flashing power light (unresponsive)

Hello,
Twice this week a Mac Pro Quad 2.66 has become unresponsive after being left unattended. I have revived the computer by resetting the System Management Controller (http://support.apple.com/kb/HT1806).
It's obvious this is not normal. Should I bring the computer in for repair? Is there something else I should be doing?
Connected to the computer are:
- Two Lacie Electron 19 Blue III monitors
- Lacie usb drive
- Lacie firewire 400 drive
- JVC DV-HRS2 Mini DV deck (firewire)
- both ethernet ports are being used
Thanks,

Hello,
No USB hubs or USB/FW on the monitors. The lacie drives are older models and don't have the On/Off/Auto switch.
I think this happens when the computer and drive go to sleep. I will try to change the cables and plug the drives in one at a time.
Thanks Hatter.
The hatter wrote:
A device that doesn't support sleep and loses communication. And LaCie. USB devices and cables. Any USB hub.
Could be as simple as a USB cable; Firewire cable... does the Electron have USB and/or FW ports also?
LaCie recommends unplugging everything, shutting down, no power cord even and let sit a couple minutes.
Try without your peripherals and then try one at a time.
The big problem is if you are doing a hard restart w/o repairing your drives, whether you safely eject your drives first.
LaCie cables and power adapters can be a problem as I said, but any hub, mouse, keyboard can cause a problem but most often the mouse moves but you can't do anything and system is unresponsive.
No you don't need to take it in. I doubt Apple Hardware Test would find anything either.

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