Its not a problem. The samsung logo is there because that is what the UEFI is set up to show, its quite normal, for instance, my Asus 505QA shows the asus logo about center on the screen, and the windows loading spinning wheel of marbles, or however you'd describe that below it. The blocked shutdown happens when a program is left open that needs confirmation to close, such as, if you wrote something in your word processor of choice, then either hit ALT F4 or file > exit, it wouldn't just close out right away, because its programmed to allow you to save your changes, so you don't experience data loss. So, windows realizes this and says hey, you have some things here that are telling me to tell you to save, or discard changes, then I can shut down. Along with that are buttons to cancel or do a force shutdown, but they don't always take keyboard focus. The way to prevent this from occurring is to close out all apps / programs before you shut down, if you do this, there is nothing to block the shutdown and it will happen normally.

what i don't understand, is that i check if all my programs are shut down and closed correctly, i can not find an open program. i can also not just close every thing using the task manager. i don't know what will happen with the background services.