Greetings!
Okay. If you replaced the drive, I am assuming that you built the brand new
drive using the build instructions in the FAQ.
When you mean "shuts down", do you mean that you power up the player, it shows the boot screens, including a building database line (normal for a blank drive that has not been synced before) and then "shuts down" by going into
standby mode (blank screen with standby LED pulsing in the display's upper right corner), this is totally normal. The player is on and ready for you to load music to.
If you mean that it locks up or completely powers down, that is abnormal. Try to get a
console session up and post what you see. Thanks.