<<<<help>>>my cpu not given the power to the monitor

sir,
my cpu not given the power to the moniter after start the cpu my moniter get black screen and power light is blink again and again of moniter,i checked my ram and all pluge cable and clean all the dust also........one more problem is that its not given sound of click after start the cpu.
processor fan working proplery
my monitor comapny is LG....my monitor work propely i checked with another cpu
plz tell me where is problem in my cpu,plz tell some tech solution.....i am wating for your answer