Newly built computer, monitor won't start

Okay so I've just built my first computer. My problem is that it seems to startup alright, the fans are running etc. but the screen just stays in standby mode without turning on. I have no BIOS speaker so I can't diagnose from the beeps so I took everything except the PSU out of the chassi now and put the essentials on a wooden table with esd covers underneath. I'm absolutely certain my RAM-stick is connected properly all the way down into the socket, same thing goes for the graphics card. I have also tried rearranging the memory setup in several different ways. I have also tried reapplying the cooling paste and reinstalling CPU.

Here's my setup:

OS: Haven't installed yet
Processor: Intel i5-750
CPU-cooler: Akasa venom with AC MX-2 paste that I put on myself
Motherboard: Gigabyte GA-P55A-UD3
Memory: 2x 2gb Corsair 1600 mhz cl8 1.65 V
Graphics Card: Gigabyte Geforce GTX 460
HDD: Samsung Spinpoint F3 1 tb
PSU: Corsair 650 TX
Other :Benq 2112HD monitor + HDMI cable.

This is what is setup on my wooden table atm:

One motherboard with 1 ram stick, a graphics card and a cpu+cpu fan with cooling paste applied.

1x power cable to a power outlet with over current protection etc.
1x 24-pin cable connected to the motherboard
1x 6-pin 12VATX cable connected to the motherboard
1x 2 pin Power Switch connected to motherboard

Graphics card
2x 6 pin PCI-Express cables connected to the PSU

1x power cable to a power outlet with over current protection etc.
1x HDMI-cable to the graphics card

1x 4-pin cable to the cpu_fan spot on the motherboard.

Have I forgotten anything? This is my first time building a computer. Gonna go for a couple of hours but will check back soon, just in case I don't answer immediately.
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More about newly built computer monitor start
  1. Work through our standard checklist and troubleshooting thread:
    I mean work through, not just read over it.

    Breadboard - that will eliminate any kind of case problem you might have.

    The breadboarding thread has a paragraph about how to build and test a PC in stages.

    Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You really, really need a case speaker. Without one, you will be blindly replacing parts, instead of systematic troubleshooting. If your case or motherboard didn't come with a system speaker, you can buy one here:

    You can turn on the PC by momentarily shorting the two pins that the case power switch goes to.

    You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU.Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

    If no beeps:
    At this point, you can sort of check the PSU. Try to borrow a known good PSU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

    The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

    You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.

    This checks the PSU under no load conditions, so it is not completely reliable. But if
    it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

    If the system beeps:
    If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should
    change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

    Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

    Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step.
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