USB Devices Problem on Lenovo 8985-A22 Desktops

By sunilsjadhav ·
I have 3nos Lenovo 8985-A22 Series Desktops.
in two of them giving me the problem for all usb devices i connect to them. e.g.
1. My USB mouse & USB Keyboard is get disconnected automatically
2. USB Pen Drive (Flash Drive) not working properly.

Solution i try

1. Reinstall USB host controller
2. Change the Keyboard, Mouse, Pen drive etc.
3. Format PC & reinstall OS

Still problem is not solved, please help me.

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