I think a better idea would be removing/unplugging the hard drive, all of the memory, any installed cards, etc. and just try to boot the Macintosh SE/30 with the bare motherboard and ROM SIMM. If you get a normal display, the SIMM should be fine, while one of your components (i.e: RAM) could be at fault.

Also, make sure you plugged in the ROM SIMM correctly; if you don't, you're gonna get a death chime and nothing else.