Most of the time you're never aware your account has gone under review. Try contacting Google if your ads are not displaying and they should tell you if this is because your account is under review. This took me approx 3 days to finally get my advert to display for search, and I only found out my account was under review by contacting them.
it could be you need to pay more for your ad to show up that is how pay per click works,a bidding process .do not spend to much though as I tried to make money with clickbank I spent time and money and did not make a $ .I was shocked expecting hundreds of clicks nothing I even tried email blasting nothing.
It all depends on your keywords. You can't expect to promote weight loss keywords and get $.05 per click. It's what Google wants to charge, not how much you want to pay. Bidding $.05 on a saturated niche will get you no clicks. What niche are you promoting?