Hubs causing startup problems?

My iMac would not start. I unplugged a hub, and he started upward.

Next week it wouldn't start again. I unplugged an another hub and he started upward.

!? -Other items plugged into this USB port work.

Are here a sort of "hub system files" somewhere that must be purged... or ideas?

Is the hub self powered?

The mac also of starts not when there is nothing connected to the hub?

Tags: Mac OS & System Software

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    Visit our Microsoft answers feedback Forum and let us know what you think.
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