HDMI703 :
So i just installed some 5V leds into my case and connected them into the back panel usb and when i turn my computer off they are still on. how i can turn them on ?? you can see my pc specs in my signature
These days, the Power wire of the USB are designed to stay on, so you can bring the computer back to life when you hit your USB keyboard or your USB mouse or your USB connected Infrared, or some folks like to connect their mobiles to the PC USB to charge, even when the PC if off/sleep. Are you sure you want them turned off?
If you just want some LED indicator, just wire them to a spared HDD power connector, those are guaranteed to be off when sleep/OFF, don't wire them to USB.