Question : Problem: convert USB keyboard tp ps2

I have usb keyboard ,but i dont want to usb keyboard .i have buyed connectors and its  image i have attached .
these connectors are not working .i have buyed diffrent connectors of same type .
but no success.

Answer : Problem: convert USB keyboard tp ps2

USB signals are transmitted on a twisted pair data cable with 90© ±15% impedance,[7] labeled D+ and D. These collectively use half-duplex differential signaling

http://en.wikipedia.org/wiki/USB

While the PS/2 Data signal is Serial data at 10 to 16 kHz with 1 stop bit, 1 start bit, 1 parity bit (odd)

http://en.wikipedia.org/wiki/PS/2_connector

Although both have 4 wires but they are totally deferent, so the quality/color of adapters will not do, the only thing is that if the keyboard manufacturer build keyboard which supports both then it will work, otherwise it will not.