A seizure in the sim gives you only N1 seizure or N1/N2?
You have to look at the N2 gauge, dont try to second guess what failure was input.
let's say you don't start the APU with dual seizure
Why would you not start the APU? If it is also U/S then with two seized N2's and no AC electrics you will lose hydraulic pressure.
Do you normally get this much of a hard time in the sim?