We ran into a rather bizarre problem a while back with a VoIP installation.  The installation consisted of a cisco 3560 48-port PoE switch feeding 35 Polycom phones.  Most of the phones powered up fine but a few wouldn’t boot. When a working phone was unplugged, another previously-dead phone would come to life, but the one just unplugged would then remain dead when reconnected. Checking the power… 
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