Having the same issue with my BAII Plus. Bizarrely I have figured out that it works fine when I set I= zero or keep the number of CFs to just 2. As soon as I exceed 2 Cash Flows or have a non-zero interest rate the screen goes blank and never comes back – I have to hard reset on the back.
I even waited multiple minutes in case it was just churning through the calculation for a long time.
Every other function works quickly and accurately so I have no idea why CFs in particular would cause this.
Cheers in advance