Can't See My AdWords Ad

I received 4 questions over the long weekend in response to my I'll answer your ppc questions post and they were all pretty much the same - people having problems seeing their AdWords ad.

If your question was;

Why can't I see my AdWords Ad?
Can't get my AdWords ad to show up.
AdWords ad not working.
AdWords ad showed up yesterday but it's gone today.

Here is your answer, or at least your starting point:

https://adwords.google.com/support/bin/answer.py?answer=6105