What should I do if usb does not work?

Progress does not stand still and the time when the only external ports were parallel LPT, better known as printer, and serial - COM, have long since sunk into oblivion. Not only laptops and computers, but all the rest of modern digital technology necessarily contains a universal serial USB interface. Indeed, the word "universal" bus carries with the full right: after all, initially, when it was developed, the task was to create a bus that would allow installing a small controller in the daughter device to interact with it. For example, even hard drives of PATA and SATA standards through a special adapter work correctly with the USB bus, let alone other, less specific components. In addition, having made power and signal contacts of different length, the developers managed to solve the problem of "hot" connection and shutdown. Attempting to connect the included device to the ports of old buses (LPT, COM, PS / 2) of a working computer in most cases caused the microcontrollers to fail.

The universal USB bus proved to be so successful that more than 18 years have passed since the first revision to the present day, which by the standards of computer technology is an impressive time. Unfortunately, even this development sometimes fails: then the usb modem does not work , then the mouse, then the webcam. As a result, the user turns out to be "without hands" and is forced to look for a solution. Surprisingly, most often usb does not work for a laptop, not for a personal computer. Owners of similar devices in this situation often recall the laws of Murphy, according to which if trouble can happen - it happens. In fact, one must remember that there is always a solution, and the diagnosis "usb does not work" is only a temporary inconvenience. Next, we'll look at the causes of this malfunction and how to fix it.

Having glanced in the service center on service of computer facilities, it is possible to learn, that usb at laptops more often does not work. A high degree of integration of electronic components, active use and high internal temperatures - these are the main threats to the health of USB. The metal connector on the case to which the corresponding devices are connected is just the "tip of the iceberg", the mechanical implementation of the digital bus interface. From it, the wires go to the USB controller, which allows the bus to interact with all other logic of the computer. A controller is an electronic microcircuit (or part of it). Sometimes, due to the inefficient operation of the cooling system, the temperature inside the notebook's case increases excessively, the board expands slightly, and the badly soldered legs of the microcircuits are disconnected. The result is that usb does not work. The solution is one - a service center.

Although there are several connectors, they can all be connected to one controller, which imposes certain limitations on the total current. Constant simultaneous use of several powerful USB devices at once makes the controller work at the limit of its capabilities, heating it up. This should be avoided. The new revision (USB3.0) supports almost twice as much current as the common 2.0 and when you buy a new computer, you need to consider this.

For personal computers, the problem of overheating is not so acute. They do not work usb for other reasons. The main one is the combustion of the controller due to incorrect connection of the connectors of the front panel of the system unit. On all cases ahead there are USB connectors, which connect to the motherboard wiring harness (pigtail) with a shoe at the end. It is enough to accidentally deploy the shoe by turning it on the contrary, and when the device is connected, both the device itself and the controller inside the computer are often damaged. Collecting a computer thoughtfully and without haste, you can protect yourself from such trouble.

USB may not work due to mechanical loosening of the pins in the connector. In any service center such breakages are quickly eliminated.

And the simplest reasons

- USB support is disabled in the BIOS of the computer. Doing this without a good reason is not recommended;

- The USB device plug is not fully inserted;

- software failure. You can try another operating system.