Replaced the USB 2.0 hub with this one. I plugged it in and everything works great except when MY iMac desktop goes to sleep. Once mine goes to sleep it actually becomes unresponsive to mouse, keyboard and clicks, taps etc on the buttons. The only way to restart my iMac is to unplug my iMac, wait 30 seconds, and then plug it back in. I've had my iMac for four years and haven't had any problems. Others seem to have similar problems. I wasn't looking for a suitable replacement.
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