Putting together a computer is much easier than you think as long as you have the right parts.
Step 1: Make Sure You Have a Good Area to Work In
Make sure the area you are working in has ample space and good lighting, so you can see what you are doing.
Step 2: Get Appropriate Tools
For working inside a computer, you will need a screwdriver, and screws should come with your computer case.
Step 3: Start Assembling
Using the manuals that came with your motherboard and case, find out where exactly to place your motherboard in the PC case and screw the appropriate screws in.
Step 4: Place Your Hard Drive in a Hard Drive Bay
Choose a slot for your hard drive and screw it into place. Connect the SATA cable from the motherboard to the Hard drive.
Step 5: Connect the Power Supply
With the power supply in, place all cables in their correct slots on the motherboard. Connect the 24 pin connector to the slot in the motherboard and the PCI-E cable to power the CPU. Connect the power supply to the Hard drive as well.
Step 6: Connect Fans
Connect your fan/fans to the appropriate power supply cable, and connect the CPU fan to the motherboard to give it power.
Step 7: Install RAM
Place your ram sticks in their slots in the motherboard until they lock into place.
Step 8: Install Graphics Card (GPU)
Unscrew the two screws on the PCI-E slot and place your graphics card into the PCI-E slot until it locks in. Screw the two screws back in, holding the GPU in place. Connect your GPU to a PCI-E cable from your power supply to give the GPU power.
Step 9: Connect Your Cables
Close the side panel, and then plug in your PC to power to make sure it turns on. Connect your mouse, keyboard, monitor, etc and make sure your PC boots up. Once you get display on the monitor, you are good.
Step 10: Install Operating System
Once you've chosen your Operating system and purchased it (Windows, Linux, etc) put the disc in and turn the PC on. It should boot automatically to the disc and the installation will begin.