#455914 - 07/28/0410:03 PMRe:Sleeves on my power supply
If it is anything like the older PowerMac models, it is a black ring around the cord that keeps it from touching whatever is near it; in this case, the power supply. I would imagine that it is put there for heat purposes.
My suggestion is to leave it alone; work around it. It was there for a reason. No sense potentially destroying a machine if you can work around it.
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