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 recognize it. For assistance in solving this problem, click this message).

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 recognize it. For assistance 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 previous method, cannot solved the error, you need to repair or reinstall the Windows Operating System because sometimes the O. S. (Operating System) gets corrupted due to viruses or some other reasons. When I finished repairing the O. S., I turned on the laptop once again and unluckily the problem didn’t gone away. Thinking that the corrupted system cannot be restored by simply 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” usually when you reformatted the Windows Operating System, all will be back to normal, but in this case it did not. I now suspect 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 previous 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 normal supply voltage for the USB port when it is working fine is 5v DC enough to power up USB devices. The voltage is just normal after I tested it, This problem is a little bit harder because I’ve already done several possible solutions that I usually used to solve this kind of problem. After doing all the previous steps and still not fixed the problem, I stopped for awhile and further analyze what’s really 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 supply voltage is already deteriorated. For your information even if the power supply voltage is just normal, say 5 volts DC, but the current (measured in amperes) is already deteriorated, still It cannot supply enough power in order to make the USB devices work. The final method 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 completely eliminated.

Hope this article helped you get some ideas about solving USB Not Recognized problem in Windows. You can watch HD Laptop Repair Videos to see more quality laptop repair in Action

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