On my computer has not sprung USB that button

My system is XP sp2 I inserts the U plate or P3 after the USB mouth my computer is may distinguish
But why in my computer’s right bottom hasn’t sprung the USB equipment’s button??
Possibly is the connection is not good! Or has not inserted steadily! Has not distinguished.Again and so on.Your USB connection too has been old? Is the USB1.0 connection? My family table model is also 1.0, when many inserts the U plate not to read.