Ha!!!

Problem solved. I'm so glad I started the tips & tricks thread - it just solved a MAJOR problem for me.

Solution:

Running the F1 start-up test, I initially only had a KET02 error. This one requires a very special procedure to fix as explained in detail by Tonewheeldude.

Well, as soon as that was fixed, I now had the following errors:

KET03
KET04
KET05
KET06
KET09
KET11

I fixed them one by one & viola!!! I have CONCERT GRAND top left. I can now continue to install all my upgrades.

Tx Darren for your detailed description. It is late, yet I'm going to install all upgrades and play with them before going to bed... Sleep'll be very low on my priority list for tonighht!!!

Keep well all my friends,

Henni