Why did my computer stop charging my iphone?

I have tried all the ports and changed usb cables, It charges using the wall. I tried plugging in a flash drive and it didn't recognize that either. Itunes does not recognize it either, The itunes program says I need to plug in my phone using a usb cable. Could I have accidently hit something that turned off my power to my ports?

Check if your usb ports are working with printer, etc. Some are low power, some high power charging. Or cables are defective/fake

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