We have a Sunseeker E450 and this same thing happened earlier this summer. All the dash indicators were lit up, I don't believe any lights worked on the outside, pushing in the brake before shifting was not the issue, the wheel was not locked, the gear shift was completely frozen.
After reading on here and other places I found one fuse under the steering wheel. It was the 'Brake Shift Interlock' location #5. I pulled the fuse and re-seated/re-installed it, the same fuse and everything worked again.
I really hope this works for you as I remember how frustrating this was.