The door is a bit of a pain, my 3000 wouldn't open either.
You need to make sure it's powered up and manually ease the door open after you press the Open button.
Got to do it slowly with as little force as possible.
Once the mechanism kicks in it'll open fine. The reason for the complexity is so you can also press the button to close the door after putting a record in.
So it's all very automated and futuristic!
Rock On.