Does the notch on the ROM line up with the notch on the ROM socket? That's the only way to verify that pins are aligned properly. Maybe you have them properly inserted, but I can't tell you yes or no based on orientation with respect to the daughter card. If the ROMs are inserted in reverse, you can get the black screen.
Did you reinsert the 2.04 as wlemonds asked and get it to boot.
Also, how did you remove the ROMS? Did you pry them out with a screwdriver? If the machine doesn't boot with the original ROMS reinserted, you might have damaged a trace or socket with a the screwdriver if you weren't careful.
Finally, is the daughter card in when you try to boot? If you removed it, it won't boot without it present and properly inserted.