The new U disk.You can use it on other people's machines.My computer (with the same socket), plug in other U disk can also be used.But this is the U disk, plug in this computer can not be used.Seek helpI don't want to buy a new one. It cost me a lot of money
Your machine should be in the virus, I have also appeared before the same symptoms, and then press a key to restore it, and reinstall the antivirus software just fine.
May be your U disk voltage requirements are relatively high, the chassis front USB port can provide voltage than the box behind the USB port is much lower, you put the U disk inserted into the box behind the USB port try
From my maintenance experience, I can not identify, first, the computer can not recognize the USB device.Two is the USB device, not recognized by the computer. Let's first judge whether it's a computer problem or a USB device problem. We can use other USB devices to test the computer. Is there any problem?.If it's a computer problem. Is your computer damaged by viruses?. Is the driver of USB2.0 installed or not compatible?. Is there a software conflict (first solving a software problem), usually a hint to install the driver?.If it's a computer hardware problem. We use four line multimeter USB (red +5V white DATA- data - green DATA- data - black wire) multimeter to measure the red pen black pen (white and green line. The resistance does not differ 50 euro, these two lines are out of the South Bridge, and if the resistance changes too large, you can judge the South Bridge problem. Explains the module burned inside the USB bridge.Take a look at the outside USB device, and many drivers now. Even without a driver, it doesn't come out of recognition. There are several instances of an unrecognized situation. A USB data line is blocked or out of contact, usually touching that place, because time is long, it may be rusted inside, bulging, and there may be something blocking it inside. Two USB lines are blocked. Red line impassability, what reaction will not have, white line impassability, cannot identify. The green barrier is not recognized. White and green line can not be reversed. Also can not identify. There was no reaction to the black line, and the method of measurement had already been mentioned.Attention. Red line 5V low voltage can also lead to unrecognizedThree USB board internal problems. 1, the crystal oscillator is not good, can not shake. 2 crystal oscillator capacitor (20P) has two3 reset capacitor, bad resistance. Reset voltage bias high 4 three terminal IC poor voltage supply for IC is not enough 5.
Follow these steps to eliminate trouble step by step.1, to ensure that no problem in the USB interface, plug in the U disk, listen to the speakers have Ding Dong sound sound. If nothing sounds, the computer doesn't recognize the USB device, and that might be the U disk is broken.2, if there is a sound, indicating that the USB device can be detected, it may be a system problem, resulting in no identification. Operate as follows:1) right-click the computer, properties, device manager, disk manager.2) if there is a yellow exclamation mark, right click it unloaded.3) if there is a disk marked with a black arrow down, that is disabled, right click and start it. Then refresh or restart the computer, usually found.4) if there is no problem in the device manager, there is no automatic assignment letter. Right click on the computer (or my computer), manage, disk management. To find the change disk partition it with the right mouse button, select "change drive letter and path", then select "add", can be assigned a letter.If not, that is, the U disk is broken, or the system related features are damaged. Try it on someone else's computer.Also, pay special attention to the fact that if the USB interface is blue, it is due to no drive. Since the following win8 system does not have a built-in USB 3 driver, the USB interface is not available until the driver is installed separately.
This is perhaps the USB power supply shortage caused by the case, you put it to the onboard USB to try, it should be, is what I want to explain, each U disk or computer power supply with USB objects are not the same, than said, I have a U disk in understanding others before the case USB can, and I don't know, but others some of the U disk, in my USB, in his will not work, this is the same reason, this is normal. Please don't worry.. If you don't work in the back, then you can find someone from the computer company to help you see it.
