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I have several campaigns which get impressions for those keywords.
But this one has not had a single impression yet (for days now). I raised (X4) the PPC but no impressions.
Why is that?
is it blocked? how can I check that?
If you are using different keywords then,
1. try to increase the campaign budget (for the time being and then reduce it once you start to generate impressions/clicks).
2. Are you using negative keywords? See if any important keyword has been entered in negative keyword list, by mistake. You can find this issue by using "Ad Testing" tool.
If you want to use duplicated campaigns, then try to geo-target them to different locations.