How to fix USB not recognized in Windows - Acer Aspire 3640 laptop problem

Laptop make and model: Acer Aspire 3640
Problem: This laptop came with the following request:

USB is not recognized (one of the USB devices connected to the computer is interrupted, and the windows did not recognize. To help solve this problem, click this message).

Diagnosis, cause and solution: every time you insert a USB flash drive in this laptop, the following error message would come up: unrecognized USB (a USB device to thisMachine> is confused, and do not recognize the windows. To help solve this problem, see this post).

One cause of this problem is that the drivers for the USB controller will be damaged. The first thing I did was update the drivers for the USB controller. After updating the driver, the problem again. If the above method can not solve the problem, you need to repair or reinstall the Windows operating system, because sometimes the operating system(Operating System) is damaged by viruses or other reasons. When I finished repairing the operating system, I turned on the laptop again and unfortunately the problem has not disappeared. Do you think that the damaged system can not be restored simply by repairing the operating system, was the second step, I, I hope that this notebook can be reformatted again. After reformatting the laptop and the installation of any drivers for peripheral devices, still no luck, because the errornot eliminated.

I said to myself, "this can not be" generally, if you formatted the Windows operating system, everything will be normal again, but in this case is not over. I think that now the laptop hardware problem, so I decided to disassemble the laptop and load all the dust from the motherboard, as I said in my previous article that the dust is also a factor of electronic components on the motherboard causes short circuit. Because if it becomes a thick dustConductor.

Created after the dismantling of the laptop and all the dust. I tested the voltage at the connection of the USB port. The normal supply voltage for the USB port if it works well, it is sufficient to 5V DC USB devices. The tension is normal, after I tried, this problem is a bit 'hard because I have several possible solutions that I used in the rule that you have done to solve this problem. After all the above steps and still have not solved the problem, Istopped for a while 'to continue to analyze what is really causing the problem.

After thinking, it occurred to me what happens when the current flow at the USB port that is generated from the supply voltage is already degraded. For your information, even if the power supply is normal, say 5 volts DC, but the current (measured in amperes) is already deteriorated, but can not provide enough power for USB devices work. The last method that I have to solve this problemwas that I was an external USB 2.0 hub that is connected to the laptop via a USB port. After installing the USB 2.0 hub and when I removed any USB device, it already works perfectly fine and the USB port was not recognized problem, completely.

I hope this article helped you get a couple of ideas to solve the USB is not recognized in Windows.

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