Laptop Brand and Model: Acer Aspire 3640
Problem: This laptop came in with the following complaint:
Usb Not Recognized (one of the Usb devices attached to this computer has malfunctioned, and windows does not identify it. For aid in solving this problem, click this message).
Acer Laptop Problems
Diagnosis, Cause and Remedy: Every time a Usb is inserted into this laptop the following error would come out: Usb Not Recognized (one of the Usb devices attached to this computer has malfunctioned, and windows does not identify it. For aid in solving this problem, click this message).
One cause of this problem is that the driver for the Usb controller gets corrupted. The very first thing I did was updating the driver for the Usb controller. After updating the driver, the problem still exist. If the former method, cannot solved the error, you need to fix or reinstall the Windows Operating principles because sometimes the O. S. (Operating System) gets corrupted due to viruses or some other reasons. When I accomplished repairing the O. S., I turned on the laptop once again and unluckily the problem didn't gone away. Thinking that the corrupted principles cannot be restored by plainly repairing the Operating System, the second step I did was that I reformatted this laptop hoping it can be restore. After reformatting the laptop and installing the respective drivers for the peripheral devices, still no luck, because the error was not eliminated.
I told myself "this can't be" commonly when you reformatted the Windows Operating System, all will be back to normal, but in this case it did not. I now presume hardware problem on the laptop, So I decided to disassemble the laptop and free the motherboard from all dust, as what I've said on my former articles, that the dust is also one factor which causes the motherboard electronic components to be shorted. Because when dust gets thick it will become a conductor.
After disassembling the laptop and taken out all the dust. I tested the voltage on the terminal of the Usb port. The general furnish voltage for the Usb port when it is working fine is 5v Dc enough to power up Usb devices. The voltage is just general after I tested it, This problem is a itsybitsy bit harder because I've already done several possible solutions that I commonly used to solve this kind of problem. After doing all the former steps and still not fixed the problem, I stopped for awhile and supplementary analyze what's surely causes the problem.
Upon thinking, It came to my mind that what if the flow of current on the Usb port that is generated by the furnish voltage is already deteriorated. For your information even if the power furnish voltage is just normal, say 5 volts Dc, but the current (measured in amperes) is already deteriorated, still It cannot furnish enough power in order to make the Usb devices work. The final formula I've made to solve this problem was that I used an external Usb hub 2.0 which is inserted from one of the laptop's Usb port. After installing the Usb hub 2.0 and whenever I connect any Usb devices, it already works perfectly fine and the Usb Not Recognized problem was thoroughly eliminated.
Hope this report helped you get some ideas about solving Usb Not Recognized problem in Windows.
How to mend Usb Not Recognized in Windows - question of Acer Aspire 3640 Laptop