All the USB ports of my computer are not functioning not unless i use a USB cable to connect a particular usb device. what could be the problem with my computer.

Can you give more specific detail of your problem?

yeah , what type of device ,as except for thumb-drives and card readers ,most usb devices connect via a usb cable

a modem stick and flash disk can not be recognized when plugged directly to the USB port, but when i use a usb cable they get recognized.

When using a mouse does it work? Based on the modem stick and flash disk, nothing can still be concluded. When you said not functioning, does the flash disk get detected in my computer but you are unable to use it?

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.