New Computer Compatibility issue

hey guy i just got a new motherboard for my computer and have been having problems while trying to boot no image appears on my monitor even though all lights (on the motherboard) and fans come on in the computer. I just got this motherboard installed and have tried everything from switching the graphic card to a different slot only booting with one stick of ram.I triple checked all connections and im begging to think that it is an error of something isnt compatable with the motherboard but i double checked all specs and the computer should work. I eventually thought i broke something and decided to put the old motherboard back in to see if the computer worked and the computer turned on and ran fine? Please help :D
UPGRADED:
motherboard and ram

NEW SPECS:

motherboard:MSI 870A-G54
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130275

cpu:AMD Athlon II X4 620 Propus
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103706&cm_re=quad_core_processor-_-19-103-706-_-Product

video card:EVGA 512-P2-N738-LR GeForce 8400
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130313&cm_re=8400-_-14-130-313-_-Product

power supply:Rosewill Stallion Series RD500
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182076

cpu cooler:COOLER MASTER Hyper 212 Plus
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103065&cm_re=hyper_212-_-35-103-065-_-Product

hard drive:Western Digital Caviar Black WD500gb
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136320&cm_re=500_gb_hard_drive-_-22-136-320-_-Product

cdrom :ASUS Black 24X cdrom
http://www.newegg.com/Product/Product.aspx?Item=N82E16827135204

memory: Patriot G Series ‘Sector 5’ Edition 4GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16820220435
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  1. You went through the sticky right?

    Does your old mobo support DDR3? If so, throw that in and test it to eliminate RAM. Could just be your new mobo is bad.
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