I tested various things, and I use same setup on 2 accounts. The difference was in 1. keywords 2. domain / content 3. gmail.
Account 1 ( aged gmail, aged domain with long time indexed content on white hat keyword ). Whole new adwords account, and ads go live until 12 hours
Account 2 ( new gmail, new domain, no indexed content, black hat keyword ). Today is 15th day on "we can't currently determine why your ads isn't showing.
So it isn't about pc, browser, card, ip and things in setup ( they play big role, but not major from my experience ). It is about keyword and website. Don't know what had the best result from these three thing that I mentioned, but i hope it help you guys.