satyamdubey :
Are the cpu fans and led coming on?
if you can't hear a beep then you can force the system to generate one by removing all ram sticks from the board.
If you hear a constant beep or a ram missing beep code, there is a fair chance that the mobo and cpu are working as the cpu is initialized before the rams.
if such is the case, then this could a problem with the display adapter.
yes all the fans and leds are working properly
so i started checking the video card with another pc and it worked correctly
then i checked the psu i uninstalled it and test it in another system and worked.
i did the same with all the memories the hard drives and they were all working correctly,
the only think i cant test is wether its the motherboard dead or the processor dead,
so how can i know if it is the processor dead or the motherboard dead . Every time I remove my cpu everything boot ok but nothing is displayed on the screen and no beep . but when I put the cpu in its position it boots for few seconds and then is dead , it doesnt boot again . But if u have to unplug it will do the same and then nothing .