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I am using a Asus M4A785TD-M EVO motherboard with AMD phenom processor and 2 gb kingston RAM. I wanted to upgrade the RAM on my computer so I bought a Kingston KVR13N9S8 4GB RAM. But if I am trying to start the computer then it will not boot at all. If I am using the old 2gb RAM then my pc will boot up fine? So does this means that this RAM is not compatible with my computer?
Since it is a new RAM stick then it seems to be a bad memory for sure. But in anycase you can try to test the RAM with memtest86 one at a time for 4-5 times and see if you get any kind of error. If all memory sticks are fine in the result then you should probably test them in different RAM slot on your motherboard. If the results suggest a bad memory stick then you can try to RMA the memory from where you have purchased it.
If you have bought the KVR1333D3N9/4G model of Kingston RAM then it should work with the mobo that you have since it is compatible. But if you have bought a KVR13N9S8/4-SP then it is not compatible with the Asus M4A785TD-V EVO motherboard since it is a single ranked memory where else in your case your motherboard requires a dual ranked RAM.
Have you tried updating the Asus M4A785TD motherboard BIOS to the latest version? Just go the link below and download the latest BIOS file available for your motherboard. Note that you need to first select the operating system that you have installed in your computer and based upon that only you will get the proper BIOS file for the OS (the latest bios seems to be BIOS 2104 version):
http://www.asus.com/Motherboards/M4A785TDM_EVO/#support