I have currently 4 USB ports in my HP DV6 1337tx Laptop. Everything was fine until before someday when I saw my pendrive is being detected and within 3-4 seconds it is being undetected again. That thing happened to only a particular port. I use 3G modem to access internet. At the same port I see the same problem. Now the port is taking any pendrive correctly. But my modem is continuously detected and undetected by the very same port saying "No Device". So I stopped using that particular port and everything is fine as of now. Now I see another problem arising that some particular pendrives are not being detected by any of my ports but they are detected by other laptops.
So all in all I see all of my pendrive ports are malfunctioning very badly. So how can I "reset" them back to work fine as they did before?