Fried USB ports?

Hi - new user here. Wondering if anyone can shed light on a problem:
Just moved house, and have been setting up iMac. However, when I tried plugging in my Belkin USB port expander, and then plugging in applications to that device, the Mac told me the USB was overdrawing power (hadn't seen that message before).
Since then, none of my USB ports work, which means I can't use the keyboard or the mouse. Also, upon restarting the machine, it tried to find a Bluetooth mouse. Maybe it can't find the regular one, so figured it should look for a remote device.
Can anyone help? If I have fried my ports, if there any succour to be had?
Thanks a million in advance....

Sorry to hear of your problem. I assume you unplugged the port expander and then tried plugging just the keyboard in to your Mac with the mouse plugged in to the keyboard?If so, did you try using different ports? Imacs have 2 or 3 USB ports depending on the model so you want to try each one. Make sure to just try just the keyboard and mouse with nothing else connected even if anything else connected is powered off. I don't know how it would automatically try to find a bluetooth mouse unless bluetooth was turned on so you might just want to turn bluetooth off for now until you figure out whether you fried your USB ports or not.

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    1 2.3 GHz Intel Core i7 CPU: 4-core
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    BANK 1/DIMM0
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    System Software: ℹ️
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    USB Information: ℹ️
    Apple Internal Memory Card Reader
    Apple Inc. BRCM20702 Hub
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