So after pc in and out over 300 million times, and over 3 weeks down time, I managed to fix my Rio Exec 2, PC MK5 by myself and it is now up and running and is a happy bunny again.
Just saying thanks for all your suggestions etc. If you want to know how I sorted it out, after killing it by mistakenly putting a T7 game on a Rio Cabinet let me know and I will pm you with the solution.
Was a real nightmare to do, but I am pleased as I now know loads about Rio Cabinets and my perseverance with it paid off