Why does my system not output display?

[XtremeAero426]

I recently bought some parts for a new PC. When I put it together, nothing showed up on the screen from HDMI or DVI. I tried using a different power supply, running with and without a GPU, running without an HDD, and swapping out the RAM. The CPU fan does turn on and the power and reset buttons work.
Here are the specs:
Intel Pentium G840
ASRock B75M-ITX
EVGA GTX 650
What's wrong with my system?

Edit: Forgot to add this detail: the system does not power up when it is in the clear cmos state.

 

[ingtar33]

unless you're listing your parts wrong that cpu won't work with that motherboard.
thats a lga 775 cpu
thats a lga 1155 motherboard

they don't match.

 

[unksol]

Did you follow the steps you are supposed to BEFORE posting about no video issues?

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[XtremeAero426]

unless you're listing your parts wrong that cpu won't work with that motherboard.
thats a lga 775 cpu
thats a lga 1155 motherboard

they don't match.

No, the Pentium G840 is an LGA1155 processor.

Source: http://ark.intel.com/products/53490/Intel-Pentium-Processor-G840-3M-Cache-2_80-GHz

 

[XtremeAero426]

Did you follow the steps you are supposed to BEFORE posting about no video issues?

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

Yes, the only thing that hasn't been done is the system speaker which did not come with the motherboard. I have just ordered one and will update the thread once I get it in the mail.

 

[ingtar33]

unless you're listing your parts wrong that cpu won't work with that motherboard.
thats a lga 775 cpu
thats a lga 1155 motherboard

they don't match.

No, the Pentium G840 is an LGA1155 processor.

Source: http://ark.intel.com/products/53490/Intel-Pentium-Processor-G840-3M-Cache-2_80-GHz

then write g840, you origionally posted pentium 840 which is an old extreme edition pentium D chip.

clr_cmos
physically removed the gpu
plug the monitors into the motherboard
let me know how it goes.

 

[XtremeAero426]

unless you're listing your parts wrong that cpu won't work with that motherboard.
thats a lga 775 cpu
thats a lga 1155 motherboard

they don't match.

No, the Pentium G840 is an LGA1155 processor.

Source: http://ark.intel.com/products/53490/Intel-Pentium-Processor-G840-3M-Cache-2_80-GHz

then write g840, you origionally posted pentium 840 which is an old extreme edition pentium D chip.

clr_cmos
physically removed the gpu
plug the monitors into the motherboard
let me know how it goes.

I said G840 in the original post. Also, I already tried those. I got the same result.

 

[XtremeAero426]

Did you follow the steps you are supposed to BEFORE posting about no video issues?

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

Ok, so my speaker arrived in the mail but I can't find the connector for it anywhere on the motherboard. Also, something else that I forgot to mention is that why my motherboard is in the clear cmos state it won't power up.