I just got my first RPi, and installed NOOBS on an SD card etc etc. Followed the official guide and all went fine and Raspbian was installed then it shutdown.
So I removed the power plug, waited a while and inserted it again. Now when it boots for a brief second I see the splash screen, then it goes to a white background with the RPi logo and "hold shift for recovery mode" then shuts down very fast. Sometimes I can hold shift and go to the install screen, sometimes it shuts down too fast.
Edit: I'm using a brand new 5V = 1A charger, and tried 3 more before buying the new one. So the power shouldn't be the issue.