haha! Sorry about that

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Tell us what you have done:
1. Install CPU into socket on motherboard, install CPU cooler and memory.
2. Install the power supply into the case (it has four screws--don't worry about the cables yet)
3. Install the motherboard assembly into the case
4. Install the graphics card into the motherboard (it's one of the long slot connectors on the motherboard where there is a slot in the case for the card connectors to go out of.
5. Install hard drives, etc.
Then, you can hook up the power cables. You'll have a really big 24 pin cable that goes into the motherboard, and then another large 8 pin cable that goes into a socket near the processor. There are cables in a little bag (I have the same power supply) that came with the power supply--take those out. Your graphics card needs power, so look near the back of the graphics card. You might just need a 6 pin cable, or you may need two...check. Then, find the cables with the red connectors on the end--those are for your graphics card. Plug one end into your graphics card and the other end into the red socket on your power supply.
Your hard drive/optical drive will also need power--get one of the cables and see what fits, then plug it into your power supply and hard drive, etc.
Fans also need power. Depending on your setup, they might use a wide 4 pin connector or else a tiny 3 pin/4 pin connector. Your CPU fan will most likely use a 4 pin connector--look near the CPU for a little white connector with 4 splines that go into the fan connector. Do the rest with your other fans--you can either power them from the motherboard if they have the small connectors, or find a power supply cable if they use a large 4 pin connector.
Lastly, you need to hook up the data cable between your hard drive/optical drive, and motherboard. Look in your motherboard box--there will be a flat, fairly narrow cable. Hook one end to your hard drive/optical drive, and then the other end to your motherboard.