boot problem

Hey, I'm facing this weird issue from sometime now.

My keyboard and mouse does not respond on the window login screen (not able to type in password) if and when I shutdown my computer and cut off all the power.

But if I just do the shutdown and no power off from switch board, then it boots fine and everything is working.

When nothing is working, I generally have to press the restart button on CPU (no other choice ) and that breaks my heart everytime thinking about my Samsung SSD.

Any idea about this issue?

Points :
No light in keyboard and mouse when they are.not responsive.
Earlier sometimes mouse was working so I was using it to restart system at login screen and then keyboard works fine.
Multiple usb points tried already.
Keyboard and mouse connected on the back of Mobo.

Specs :
i7 - Razer keyboard & mouse - Dell Mouse - 650W power supply
 
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