My keyboard's led used to be on after the shut down. So I flashed the bios with the latest bios and the problem disappered.
But that's with the keyboard, I don't know if it helps with the mouse.
If it keeps up, you might want to turn off the power supply.
The reason is your mouse will die an untimely death (light burning out).
I never owned an optical, but it would be prudent to make the light last as long as possible.
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