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Be extremely careful to a few things that happened to me (do not laught at me):
- check that the lens cap is OUT ?
- check that the auto-focus is disable (otherwise your camera will spend time failing doing focus)
- do not leave your polarisation / density filter on ?
- check that your memory card is not protected in writing ?
- check that your batteries are full
- ....

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Now, I will give you some advices on how to make GREAT or WOW star trails. Everything is about ... the foreground. You can see star trailing everywhere on earth (although limited by light pollution). So what will make the difference is your foreground !
As astronomer, I have the opportunity to make star trail from amazing observatories, such as the European Southern Observatory, in Chile. This is from the La Silla observatory.