USB port doesn't recognise USB device

[panhasakvisa]

One of my laptop(dell vostro 2421)'s usb port, i usually use for plugging usb modem, and sometimes usb flash. But one day, when i plug usb flash, it won't recognise. I plug mouse, also not recognise. But when i try to plug modem, it actually works. so Why it only work with modem but not other usb device.

 

[clayofthe757]

Go to Dell's driver site and download the latest USB drivers. It will say 'USB Controller' or something the like. That's always step one.

Good luck.

 

[panhasakvisa]

Go to Dell's driver site and download the latest USB drivers. It will say 'USB Controller' or something the like. That's always step one.

Good luck.

I went to device manager and check for driver update, but say the driver is up to date.

 

[clayofthe757]

No. Follow my first instruction. Dell may tell you something else entirely.