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Live view is typically dark for most users, with the few point stars visible only. Better gear can help and possibly using an external screen with controls to increase brightness. Don't expect a live view to be as bright and clear as a 30sec exposure stack. Canon has some third party firmware available that might achieve this effect, you'd have to look it up, magic lantern i think its called.
Also all live views I've used have a slight lag to their responsiveness, so its easy to go from out of focus where the screen looks blank, through focus and out again to out of focus again all without you seeing the stars pop out on screen. Adust slow and take hands off camera and wait a few seconds for the screen to catch up. It varies from camera to camera as the screens on cameras are not meant to be highly responsive.
You just need to get used to how YOUR gear behaves. you can set focus anywhere in the sky and move your camera to point where you want to shoot, focus never changes, its infinity in every direction in the sky for stars.
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