I DonLt Know if this is normal or not.
But when I Connect the Power Cable . Mouse powered before i Turn on my computer .
This is normal or something is wrong???
This is normal, some motherboards put power through to the usb ports when they're off (so you can do things like charge a phone while your PC is off). Often this can be turned off in the bios, but there likely isn't anything wrong, my machine does this too