I have the same console scph 77006 NTSC-J . For dvd playback, just try inserting a dvd while ur system is off, close the lid and push and hold the power button for 2 secs and then release it . This is how my modchip starts it. (it was premodded just like urs) .
I have had no issues with FMCB and if the FMCB installer had shown success on the window, then I think ur boot.elf might have been misplaced.
Could u try removing all the FMCB cnf from ur mc, install the FMCB 1.5 on ur mc, put the mc0:BOOT/BOOT.ELF and mc0:BOOT/BOOT1.ELF .
Now switchoff ur console, remove the disc in ur tray, close the lid and start the console by holding r1 or without. Also try try the same method with a disc on the console.
The only time I couldnt boot ULE on it was when my lid was open and it stayed on BSOD as such till i closed it.