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Re: usb port problem.
There r many reason not to working of usb ports.
have u noticed that when u insert any usb device it detects or not. or u may pu ausb kbd and see the lights on keyboard is flashing or not. u should mention all then only any one can helpu to find out the proper solution.
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Any USB device can be plugged into a 1.0, 2.0 or 3.0 port. If a device supports USB 3.0, you want to plug it into a USB 3 port to get the speed advantage (10 times faster). USB 3 ports have blue color inside them.
This is because you are plugging in a USB 2 device to a standard USB port, or a USB 3 device into a USB 2 port. The computer is just telling you that if you upgrade the hardware, the device will work faster. Its more of an information message than an error. Your device should still function fine.
Generally USB ports are part of the motherboard so you will not be able to replace just the USB ports. you can try to uninstall the USB controllers in device manager then reboot your computer. they should automatically get reinstalled. also try booting to safemode and check if it will recognize your USB devices.
*if you get a pop up for found new hardware when you plug in any of your USB devices then it would usually indicate that the hardware is working fine and the problem is with your OS
go to control panel -device manager and see if you have all the latest drivers downloaded and if u dont then i would try and update them. if that doesnt work search up the specific driver u need online and download and install it.
I had a client with this same issue. However, her issue was that the top left USB port would only accept flash drives. Your external harddrive is probably not getting enough power from your USB port. Try using two USB ports (you can get a connector for this) to power up the external harddrive.
I have the same problem with the USB's not working. Suppliers say Motherboard problem. solved it by purchasing a PCMCIA to USB port. at least i now have 2 USB ports. you could probably get one with 3 ports.
did u install mother board drivers /not ? install M.bord drivers. chk all usb ports are connected to mother board. if problem persists go to decice manager expand USB then right click on usb driver select uninstall. right click on usb select scan for hard ware changes .system will install that drivers automatically.
As you have already stated that the port in question can run a standard optical mouse, the port seems to be working fine.
Sometimes the drivers for a USB device need to be installed for each USB port. Maybe you have installed these drivers for 3 of your 4 USB ports, but not for the one in question, result of which is the problem you face.