Why am I not getting any power from various outlets in my home?

Remove one of the non-working outlets and tell us if the wires are under the screws on the side or connected using the little holes in the back.

There are many answers to your question, but you will need to provide me with a little more information about your outlets before I can answer you.
What type of outlets do you have? Are the two prong or 3 prong? Do your plugs fit tightly into your outlets, or are they loose?
Where are these outlets? Are they all in the same room, or are the random places, if they are please describe where they are.
Are all of your circuit breakers on, or do you have any blown fuses?
Do you have any switches that may control your outlets, and if so are the switches on?
Do you have any GFI outlets that may be tripped, or possibly stopped working?
With these questions answered I should be able to help you with your quandary, or perhaps you might find the solution to your question by answering mine:cool:

I agree with the others. What you ask a question such as this, with absolutely no detail, all you will get in reply is people asking for more details.
Understand?