Try checking the sensor in the boot that tells the roof that the boot screen is closed. The sensor is located to the left as you look in the boot and is in the part that you connect the screen to (hook). The beeping is the system telling you that the boot screen isnt closed ie not safe to open and store roof in the boot. It may well be, but the sensor may have not made that connection. Try wiggling the screen in the holder.
Macca, April 2011
