After you have rechecked all the steps we have taken so far and made sure all is ready to go you will need to plug in the connector from the power supply into the board. Most motherboards now require a minimum of a 300W PS to work efficiently and the Pentium 4 boards take a special 12V PS with two additional connectors for powering the board.
After you have connected the power supply to the board and a do quick test to see that the motherboard posts you will want to seal up the case and move forward to setting the BIOS (If needed) and beginning the installation of the primary OS and system drivers of your board.
Trouble shooting may be required if the system does not post. This can be done by unhooking all the IDE devices from the board and taking out all the parts except the memory, video card and CPU. Sometimes there can be a part that conflicts with one of the other system parts or the board itself and this is where trouble shooting comes in handy. Put the other system parts in one at a time until you find out what the problem is. Many times after this procedure is done the system will work with all the parts but this way you can step by step find out where the problem lies.
