The reason for your computer not recognizing your USB cord can be many. The first most possible one is that your USB port has stopped working and you can't do any thing about it, it must be due to the fact you are using an old computer and the USB port has malfunctioned.
The second reason for the USB not being recognized is from malfunctioning of USB cord or the device connected, for instance a malfunctioned USB flash drive is also unable to be recognized.
The third reason which is mostly found if the devices are working perfectly is because some times the BIOS of your computer has changed its setting automatically and turned off the capability of any new hardware being recognized. Therefore a simple way to solve this problem to reset BIOS. However care must be taken in this respect since you should refer to an expert before changing any settings as any wrong settings can lead to permanent damage.
If the changing or resetting of BIOS settings doesn't help, then it probably must be the Operating system that is installed, for this you can try reinstalling your OS as a last resource.
However if all the above reasons and solutions are still unable to solve your problem, it probably must be a more unique problem and you should council the vendor of your computer for more information.
The second reason for the USB not being recognized is from malfunctioning of USB cord or the device connected, for instance a malfunctioned USB flash drive is also unable to be recognized.
The third reason which is mostly found if the devices are working perfectly is because some times the BIOS of your computer has changed its setting automatically and turned off the capability of any new hardware being recognized. Therefore a simple way to solve this problem to reset BIOS. However care must be taken in this respect since you should refer to an expert before changing any settings as any wrong settings can lead to permanent damage.
If the changing or resetting of BIOS settings doesn't help, then it probably must be the Operating system that is installed, for this you can try reinstalling your OS as a last resource.
However if all the above reasons and solutions are still unable to solve your problem, it probably must be a more unique problem and you should council the vendor of your computer for more information.