Monitor won't display anything after installing new RAM

I have two RAM slots. I recently bought a new RAM card to upgrade my computer. I installed it onto my motherboard correctly: unplugging the computer, grounding myself, etc. Now, my monitor won't display anything at all, not even the BIOS screen. I removed the new RAM card and left my old one in and it still won't display anything.

I did my research and the two RAM cards that i have are exactly the same, specs and all, and they are compatible with my motherboard.

Someone please help me out :(
 
Try resetting the BIOS by removing the CMOS battery on the motherboard for a few minutes
 
It works now but if i have my two RAM cards inserted, it won't display anything on the monitor. Do i need to modify anything on the BIOS? or my Windows XP settings?
 
The activation is done automatically BY THE MOTHERBOARD! How many memory slots does the motherboard have? 2 or 4? Are they colored in pairs? If they are you must install 2 sticks in the same color slot
 
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