Now that you have read the PARTS section and know what each part does and why you need it, this section will be very quick and short. This is where I will get straight to the point and try not to baffle you with tech terms. It also does not matter what order you install these parts. Everybody has their own personal preference. I will just list the steps in the same order that I listed the parts in the last section.
1. Prepping the case
First I will assume that you have all of your parts ready to go. If your case did not come with cooling fans, then you should buy a couple of them and install them; One in the front sucking air in, and one in the back blowing air out. The Motherboard will go into the case, make sure that you screw it down tight, if your case did not come with extra screws, then your motherboard should have them bundled with it.
2. Inserting the processor
This is very simple, all you have to do is snap the processor into it's slot. If your not sure how to do this, check inside your motherboard's manual. All kinds processors are different.
3. Installing the memory
For this all you have to do is snap your RAM into it's slot. Make sure that you check inside your motherboard's manual to make sure that you put it in the correct slots if you have DIMM sockets, or dual channel memory.
4. Installing the hard drive
If you just have one hard drive make sure that you have the jumper on the back of the drive set to master. Next all you have to do is plug in the power cable and connect the IDE cable to the motherboard, sometimes the main IDE channel on the motherboard will be blue.
5. Installing the video card
If you are using an AGP card make sure that you snap it into your AGP slot, otherwise if it is PCI, you can put it into any of your PCI slots. That's all there is to it.
6. Installing a sound card
Most all sound cards these days are PCI so you will have to plug it into anyone of your PCI slots. However if you have a motherboard with an ISA slot and you have an ISA sound card just plug it into one of those. An ISA slot will be longer than a PCI slot and will generally be black.
7. Installing the modem
Like sound cards some modems are ISA. Just plug the modem into the correct slot. If your modem has voice capabilities you might have to connect a wire from your modem to your sound card. You should check in both your sound card and modem's manuals to see if you can do this or not. This is called a TAD connector.
8. Ethernet card
If you choose to have an Ethernet card in your PC, then you will just have to snap it into a PCI slot. If your card and motherboard have WOL (wakeup on LAN) then you will have to connect a wire from the Ethernet card to your motherboard.
9. Installing the floppy drive
Just like installing the hard drive, you will have to connect a power cable to your floppy drive, which is generally smaller than the power cable that you hooked up to your hard drive or CD drives. Your cable will also be smaller than the IDE cable that you hooked to the hard drive or CD drives, it will hook into a special slot in the motherboard.
10. Installing optical drives
This is pretty much the same for all DVD, CD-ROM and CD-RW drives. Make sure that you have a power cable plugged into each drive then just plug in your IDE cable. If you have more than one optical drive you should have one set to the master and the other set to the slave and use one cable to connect them both to an IDE channel other than the one you have the hard drive hooked up to. If you have only one free channel have your hard drive set to master and then your optical drives set to slave. However if you do this and you have a DMA hard drive, you will not be able to enable DMA in windows.
Now that you have all the main parts inside your PC you should put the case cover back on and then hook up the rest of your peripherals, such as your keyboard, mouse, printer, speakers, and whatever else you have.