The USB ports stopped working
Mac mini Late 2012 - 2.3 ghz Core i7 , - The USB ports (all4) stopped working - after I plugged all the usb devices: scanner printers hard disks -around 10-11 devices- and they were all turned on and connected to the computer via self powered usb hub, and when I started the computer I had a (USB device drawing too much power) error message , and all the usb went down , I researched and did all the suggested solutions I tried resetting NVRAM/ PRAM , and SMC. with no result, I ran the Apple Hardware (Extending) Test and the result was surprisingly “No trouble found” pass number 1 .. I re-ran the test again pass number 2 got the same result “No trouble found” yet still the usb problem exist. could it be a hardware malfunction, if so is it possible to replace the USB ports or hub or its controller only from the logic board instead of replacing the whole board?, n.b.: everything else is working fine (firewire, thunderbolt, ethernet, bluetooth, wi-fi, earphone … etc)
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