3 Replies Latest reply: Nov 10, 2012 8:07 PM by Agney Patel
I-Lin Level 1 Level 1 (0 points)

I've just installed OS X Mountain Lion (previously Snow Leopard) and found that my USB drives aren't working. I plugged in the external HDD, I could see the external HDD light is on, but the external HDD icon doesn't popup on the desktop, nor does it appear on the Finder. So I tried plugging in my USB laptop fan to check if the port is working at all, it doesn't work as well. I tried the PRAM and SMC options as prescribed in other posts. But the USB ports still do not work. Can someone please teach me how to fix this?

MacBook Pro, OS X Mountain Lion (10.8.2)