Charge cable not work on usb hub

[MacPC]

Hi, I wonder why whenever I plug the charge cable into the USB Hub, the iPhone gave me a message stating that it can't charge the iPhone. I don't remember the exact words but it 's the one with the yellow/orangish triangle with an exclamation mark. The same cable plugged in the wall charge works perfectly.

 

[maflynn]

Is the hub self powered, i.e., has its own plug or does it draw its power from your computer's USB? If the latter, there may not be enough juice to charge the iPhone with. I usually plug my iPhone directly into the computer

 

[MacPC]

Hi maylynn, thanks for the reply, yes the USB hub is powered with an external adaptor. But I resolved the issue when I reboot my iMac, refreshed the PRAM. Everything works fine now.