I am not quite sure what you mean by this, so perhaps a breif description of the two components you listed will help you:
CPU: The CPU (or Central Processing Unit) is often thought of as the Brain of the computer. It is a relatively small chip in standard computers (2 inch square rougly) and serves to compute data. Information from everything else happening in the computer is "fed" to the CPU and it performs data calculations.
Motherboard: The motherboard is like the overseer in a computer. It controls the flow of data, directing traffic. Without this component, all other components of the computer are useless as they cannot communicate with eachother.
Both components are necessities. The CPU its attached directly to the motherboard in almost all cases.
Because without it the computer would not work. It is pretty much the same as having an engine in a car.
I'm sorry about the death of your computer's motherboard. You can find a replacement on ebay.com, amazon.com or even Dell's website. Good luck on finding a replacement!
It doesn't do a lot of good if it isn't connected to the computer.
The motherboard is the main circuit intersection for the computer. Advantages to a good motherboard include having enough expansion slots and memory. Motherboards come in a range of sizes and prices to accommodate all needs.
If the fan is spinning then the problematic parts are either the CPU or Motherboard. One way to test is to put the CPU on a good motherboard, and put a good CPU on the trouble PC's motherboard. This will eliminate the part you need to fix your PC. Then replace the broken part with a new one.
Some benefits of having good computer skills are the ability to fix your own computer, work at computer related jobs, and simply understanding what is going on with a computer. Those with good computer skills are more efficient at their job which involves a computer.
small is to petite as large is to giant
salt and sugar
It is quite complicated to install a motherboard. You need to have a good understanding of the components in a computer, and how they all work together.
Yes, as long as you are not into overclocking.
Any of Intel's integrated chipset boards are good if you're considering a budget computer. Consider their Core i7 boards if you're looking for performance.
The word analogies is the plural noun of analogies. A good sentence would be, the analogies between them were outrageous.