New PC build unable to boot please help fast

Hey guys i just bought a new pc but unable to boot here are the specs

1.Gigabyte 890FX-UD7
2.Phenom ii x4 965
3.Gskill 2x2 dual channel ram
4.Cooler Master 750W GX power supply
5.HAF 932 Case
6.Sapphire Radeon 4890 1 GB
7.Seagate 500 GB baracuda 7200rpm
8.Sony dvd rw writer

OK here is the problem i fixed all the components on the motherboard and connected them with the power cables and other motheboard plugs.

Now when i press the power button all my case fans turn on and start running perfect even the cpu fan but my graphic card leds turn on and off again and again dont know what is the issue and the front panel LEDs also keep blinking on and off again and again tell me what did i do wrong please
and i am not getting any beeps
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  1. You can also do few checks on your PSU.

    Try to borrow a known good PSU. If you cannot do that, borrow 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.
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