i built the hardware and installed the software.but the programmer seems not working.the green led keeps glowing and nothing happen.... :cry:

 

If you are using WinPicProg you can manually toggle the output lines from the Hardware screen - in this way you can check and confirm that everything is connected and working correctly - just use a voltmeter on the pins of the PIC socket and make sure they change when the correct buttons are toggled, and make sure they change the correct way!. The other two LED's should light when you turn on Vpp and Vpp40.