Take Motherboard out of Case, Place it on a hard non=conductive Surface, Remove EVERything Except CPU, RAM And Video card.
Then try Turning it on, If POST is successful you should hear one single Beep, you can then shut it off and Add one component after another until it No Longer Boots.
If it doesn't Boot With Only, RAM, CPU and Video card, then One of four things is bad, or not connected correctly.
Possible, Bad/dead motherboard, CPU, RAM or Video Card.
Edit: Bah Looks I was late On Posting, Anyways, Try both Sticks by themselves to make sure it is indeed a Bad Stick.