1st time builder, graphics card problem

[nascarfreak24ny]

Hey, This is my first time on this forum, and I recently completed my first build of a gaming computer.
Specs:
i5 - 3570K (LGA 1155)
Asrock z77 pro 4 motherboard
Gigabyte AMD Radeon HD 7850 (2GB
Kingston 120 GB SSD
Win 7 64 bit
Silencer MK II 750 Watt Power supply
Ballistix 8GB ram kit, PC3 - 12800 CL9, 1.5 V
Normal CD Drive

everything works and we can get everything up and running, win 7 home screen/login screen and all of the icons on the background page, but the computer doesn't read the graphics, and the onboard bios doesnt display when it is installed and power is on and the fans spin, but nothing comes up in regards to the card. I can run VGA off of the internal graphics card, but HDMI doesnt display a picture on either card, with no display, we can hear the windows chime, but no picture. Also when I put one stick of 4GB of ram everything works fine, but with 2 sticks, there is no display but still sound. Everything seems to work except the HDMI on both, and there is no recognition of the video card in the bios. I dont mind, getting a different card, or motherboard, I have the receipt to return everything.

Thank you in advance for any help

 

[maestro0428]

Sounds like a bad memory stick from what you are saying. Have you tried both sticks in each slot? Try MemTest.

 

[nascarfreak24ny]

Sounds like a bad memory stick from what you are saying. Have you tried both sticks in each slot? Try MemTest.

Im pretty sure Ive tried every memory combination to see, but I will absolutely give that a try, my main concern is the graphics card, I dont really mind using the 4gb of ram, but thank you for your quick reply.

 

[nascarfreak24ny]

Just got another new graphics card, same make and everything, put it all in, and still nothing. Maybe a compatibility issue? Im going to call ASrock and Gigabyte to see. Anyone else have any idea?