Need help computer turns on but black screen at boot up

I'm replacing my working computer's CPU an MOBO, using AMD A4 3400 CPU, msi A55M-P33 MOBO and 2 sticks of RAM DDR3 1600 from ARES, put it togather and turn on the power, all I got is a black screen, the light is on, fan is running, Did I got some bad parts?
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  1. knightdog56 said:

    This is the 5th computers I put together, this is the first time it happen to me, I follow every step of the suggestion, still can't get to the BIOS setup page to show, no video at all. I used a good RAM from another computer, no dice, so remaining part is the MOBO or CPU, don't know which one is bad.
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