When i plug in my atv 2 into my mac pro 10.9 by micro usb the white light dose not come on why???

When i plug in my atv 2 into my mac pro 10.9 by micro usb nothing happens. in all the videos i have watched the light should come on with out the power cord. Well mine docent and i have restored it.

David,
I am not sure why they are crashing the computer, but you definiately want to be careful with an external RAID 1.  Here is what I would try first in your scenerio:
1. Reset the drives somehow.  Obviously you can't do this on the iMac, maybe by formating them one at a time on a PC.
2. Plug these drives in through a USB hub (possibily even a powered hub) since you can't connect the drives through each other.  Then before you connect the hub to the mac, you should have the drives fully spun up (in manual power mode, switch on the back) and the hub and on before connecting it to the Mac.  This way, both drives have a higher chance of appearing simulteanously to the Mac reducing any need for rebuilding because of out-of-sync issues.
3. I'd then follow the steps in this article to reformat the drives for your iMac again:
http://macs.about.com/od/usingyourmac/ss/raidmirror.htm
I've never attemepted a RAID 1 on external drives so you'd have to let me know how this goes.
If all else fails, you could jump in on an order the school makes with the following company and get an enclosure to tranfer your drives into.  We have at least three of these enclosures at school, we are running one in RAID 1 and the other two in a RAID 0 configuration.
http://eshop.macsales.com/item/OWC/MEPQ946QL2/
Nate

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