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If you see nothing at all when connecting it to the charging cable, then it sounds reasonably serious to the extent that I'd consider exchanging it for a new one from the place you purchased it from. At the very least, I'd expect to see a fitbit logo flash on the screen at the point the power is connected. Ideally, you'd also see a charging battery symbol for a while.
Mike | London, UK
Blaze, Surge, Charge 2, Charge, Flex 2 - iPad Air 2, Nokia Lumia 925 (Deceased), iPhone 6
Take a look at the Fitbit help site for further assistance and information.
Then your saying now that there is a display on the Blaze while charging.
When first plugging the tracker in , there should be a charging icon showing, after 10 seconds it should turn off. Seeing the Fitbit logo tells me that when plugging the tracker in, the tracker is doing a power up, or turning on.
In either case i wiuld read @MikeF's post above and do an exchange if possible.
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