My USB ports will not recognize any devices, iPhone or external drives. Keyboard and printer work, any suggestions?

My USB ports will not recognize any devices, iPhone or external drives. Keyboard and printer work, any suggestions?

I'd start by looking in system profiler.
the blue Apple icon > About this Mac > More info...
goto the hardware section. Scroll down and click on  USB
See what happens when you have the device plugged in & not plugged in.
Move keyboard & mouse around to verify that ports work. Plug device in a port that worked with keyboar or mouse.  Keyboard usb ports are rather low power.
Perhaps device is taking too much power.  Are devices power or unpowered?  Try connecting devices to a usb hub.
Which mac do you have?
What iMac do you have?
Report system info
Blue apple > about this Mac
click on more info
click on hardware
do not copy your serial number

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