Computer won't turn on, motherboard light is on

A family member recently broke the audio port on my motherboard by tripping on a wire. I purchased a sound card to resolve this issue, i dismantled the computer after the audio port was broken because I thought I had to replace the motherboard. A very small screw fell into the top of the PSU when i was taking the pc apart, I removed it by shaking the PSU lightly and letting it fall out the top. Upon assembling the computer again with the new sound card installed I found it would not power on. The light on the motherboard turn on and stays a solid green but the pc won't boot. Can anyone offer any advice on what to do? Could the small screw have somehow broken the PSU? It's a Corsair 850 watt PSU aswell so it's pretty decent and I am astonished if that is the problem. Thanks
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  1. remove and reseat the sound card.

    Try that

    If it still doesn't boot, remove the sound card and try booting.
  2. Yeah i tried that, anything else? Is it likely that a small screw (the ones used for srewing in a motherboard) could break the PSU? It was only in for a few minutes, I gently shook the PSU untill it fell out the top. It rattled around inside a bit but I will be amazed if that broke it.
  3. Although very unlikely, I suppose anything is possible. The best way to check your PSU is by using a digital multimeter.

    Orange = +3.3 V
    Brown = +3.3V
    Blue = -12V
    Red = +5V
    Yellow = +12V
    Green = +5V
    Purple = +5V (standby)
    Gray = 0 to +5V (zero when powered off, upto +5V when the case switch is turned on)

    Assuming that the system was still working after the audio port broke, the next thing that comes to mind is a short circuit. To test this theory, breadboard your system.

    1. remove all hardware from the mobo, except for the CPU/Heatsink
    2. remove mobo from case, and place it on a non-conductive surface (wood, cardboard, etc)
    3. remove the PSU from the case (this makes step 5 easier)
    4. insert one stick of RAM
    5. connect the PSU cables (24-pin and CPU)
    6. connect your monitor to the mobo, or install a GPU, then connect the monitor
    7. using a flathead screwdriver, jump the PWR_SW pins to turn on/off the power to the mobo.

    If the above steps don't work, try moving the RAM to a different slot. Repeat until all RAM has been used in all slots. For example: [CPU] | _ _ _ ; [CPU] _ | _ _; etc.
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