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PLEASE HELP!! NEW GRAPHICS CARD AND POWER SUPPLY but it wont display!!

Okay i have a Gateway DX4300, and i game, so if you know anything about this PC you know its can play certain games but not with the best quality and fps. so i went out and bought a Dynex 400w power supply and a NVIDIA GEFORCE GT630, and an extra CPU fan to hopefully boost gameplay and all around performance.I installed everything correctly (im pretty sure i did at-least) and when i plug it in and turn the power supply on the new LED cpu fan lights up and comes on it acts like it is trying to boot up (Hard drive start noise) but my power button wont light up (it work though, I.E it turns the leds on and off) and my keyboard and mouse aren't working(no light from mouse, or keyboard) And its also not displaying anything on my monitor. please help i just put basically my whole paycheck into upgrading and i need to know if i possibly messed something up.
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  1. Best answer
    When you swaped out the old 300w Psu that was in the system.
    And placed the 400w in.

    Double check that you connected the 24 pin atx power block to the mobo.
    And also the four pin 12v that is required to make the board fully power up.

    If you forgot to connect the four pin from the Psu two black wires and two yellows it is the cause, it can often be missed and a simple fix.

    The four pin connector should sit at the top edge of the mobo, close to the base of the psu. The board needs the four pin connected, because it feeds power to the Pci-e based card slot of the Mobo to drive the card with power.
    And also can provide power for the cpu. Again if you miss this out then it is the cause of a set of blinking leds and why the board does not post properly.

    Have a check of that four pin to see if it is connected from the Psu to the mobo.
  2. Shaun o said:
    When you swaped out the old 300w Psu that was in the system.
    And placed the 400w in.

    Double check that you connected the 24 pin atx power block to the mobo.
    And also the four pin 12v that is required to make the board fully power up.

    If you forgot to connect the four pin from the Psu two black wires and two yellows it is the cause, it can often be missed and a simple fix.

    The four pin connector should sit at the top edge of the mobo, close to the base of the psu. The board needs the four pin connected, because it feeds power to the Pci-e based card slot of the Mobo to drive the card with power.
    And also can provide power for the cpu. Again if you miss this out then it is the cause of a set of blinking leds and why the board does not post properly.

    Have a check of that four pin to see if it is connected from the Psu to the mobo.




    Thanks for the response i have the 4 pin connected and i unplugged it and plugged it back in still the same problem. any other ideas?
  3. thanks for the help guys but i decided to take all the stuff and get a refund and just put it toward a new PC. again i really appreciate the help. if anyone has any ideas for a good gaming PC for around $500 i would love to see some ideas.
  4. You could get this http://pcpartpicker.com/p/DKK4Bm for just over $500, only downside is no SSD and stock cooling for the processor, if you could stretch to 600 you could get those parts and have a pretty good pc
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