BMW Z3 Roadster key won't turn

question edited for clarity.
question moved to model category.

https://www.google.com/search?q=1998+bmw+m+roadster+trunk+won%27t+open

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the problem is that it has been parked up for 8 yrs, you really need to get a decent mobile mechanic to give it the once over, there are a number of things that it could be, they don't like being left that long & not at least started.

Check on Bimmerfest,com its a bmw forum, I have gotten alot of great answers and ideas for my 1997 z-3 roadster great site.

DIS ABLE CAR ALARM...DOES ENGINA ATLEAST MAKE CLICKING SOUND WHEN U TRY STARTING???CHECK FUSE OR STARTOR RELAY??DOES KEY HAVE CHIP INSIDE OF IT?TRY USING EXTR KEY....CHECK BATTERY CONECTIONS ALSO MAKE SURE ALL WIRES ARE CONNECTED

Hi this is not going to really help but i have sort of the same problem when i have been out in my car, get back in and turn the key.... nothing ,dead well seems that way , but turn the key again and it starts the battery is new 1year old but this happens about once every couple of weeks never happens when the car is cold ! starts first time then . Is this the same as you .My garage said it could be the ignition switch but they say it could also be earthing ,which they will check first . My car is 1998 model 1.9 . Sel

unfortunatly you will need to go to the dealer. Make sure you write it down when they give it to you. only other option you have is to replace the factory stereo with an aftermarket one. some people prefer this as they can get better features sometimes.

There are a couple of relay switches in the side of the top on the driver's side. One of these is not working. Your break lights are out because of this too. You have to apply the brake to lower or raise the top.

sounds like air or a bad radiator cap, thermostat

Try vigoursly shaking the wheel left to right right to left whilst turing the key, may have just jammed

No.
To move them, remove the trim on the inside, and remove the 3 nuts that hold the mirrors on.
You said the key word....force. They are not designed to fold in.
And at $250.00 (at least) each (that's unpainted) I don't think you want to replace them unless you have to.