Had the exact same issue as OP.
I had edited the sfo to 3.41 and transfered files from external drive to internal using Hermes 4b.
Using Open Manager 2.1F
Black screen in patch mode, 0% stall in normal mode
After numerous hexes and managers found this to be solution...
1. Boot with Hermes 4b hex loaded. (assuming this is what you installed files with)
2. Install permissions fix package from USB and run it.
3. Install latest PL3 hex (no unauth syscall)
4. boot and launch game with any BD in drive
5. Will install game data and plays!!