Suddenly no impressions?

So today all of a sudden I am getting no impressions on something that I've been spending more than $100 per day on... anyone know of any possible causes?

I'm using ad scheduling.. is it possible my campaign didn't "turn on" ?

 

Maybe google have blocked your ad campaign..

 

how would I know if that is the case?

 

there is 100 reasons why this could have happened... we need more information

it could be

billing
account review
improper setup
etc

 

It's not billing. What is account review? Improper setup?? it's been running for a long time already

 

check for any disapproved ads
you will receive a notification message in your account as well as to your email

 

Check min CPCs. If these have gone up to $10.00, it is likely that you have been "Google slapped" for some sort of practice that Google finds problematic.