SE/30 refusing to startup

I recently retrieved my beloved old SE/30 from 12 years in (safe) storage. Was working fine when I packed it away and is in great condition - except it won't boot.
Symptoms: Bright, well-adjusted raster and moving cursor; no startup tone, no disk icon, goes no further in boot process. If I insert a disk, nothing happens. Doesn't seem to get far enough to respond to keyboard commands either, so I'm really stuck. 40MB HDD spins up, as does the external (whopping!) 1GB SCSI drive. Tried internal 40MB HDD thru external SCSI port = no go. (Only difference was the cursor wouldn't move.)
With _no_ HDD attached and nothing in floppy drive, I get same symptoms (above).
"Programmers switch" does't help; one blanks the screen for an instant and returns it to same state, the other produces 000000F over 0000013 (which only means "don't do that again" near as I can tell).
I found leaking caps and replaced all caps on logic board (incl. C11, the 220mfd to nowhere), new battery, got all drives working, cleaned/reseated all chips/connectors. All that = no change.
I have Larry Pina's Dead Mac Scrolls, all 8 pages of the SE/30's schematics, and a growing list of 20+ SE/30 web sites. Hoping the gurus here might have a suggestion or offer the clue I can't seem to find anywhere else. Feels like losing an old friend…..
Are the Bourns RC network chips (marked 115-0002 C 558 8943B) at RP2, RP3, RP10 critical to startup as some suggest? Are they the next suspects?
Thanks,
Mike

Hi Jim, thanks for the kind words and response.
I'm in N. Cal. near Sacramento.
Another SE/30 would be a great help to be sure. I suppose I could dust-off my old Performa 6300, it has an external SCSI II that _might_ read the old MFS format. But - no display! No shortage of cables/adapters here, I have an old VGA - hmmm.....
I have 800K floppy drives, but only the one 1.44, and two 128K Macs (turned 512s) that are no help with the SE/30. I also have a SCSI Zip drive (and disks) packed with the SE/30 that might be handy eventually.
But I don't think I'm getting far enough in the boot process to blame drives yet. With no HDD and nothing in floppy drive, I should get a tone and disk icon/question mark, no? Machine has 5MB RAM; I tried removing the four 1MB SIMMs from bank 1 leaving four original 128s in bank 2, reversed banks, tried four 1MBs in each bank, no help (no other way to test RAM). Bad RAM would produce a sad Mac, right? "Mo" (short for Maureen) also has a Diimo board, with/without = no change. Even removed the ROM, result was horizontal bars.
This machine was my workhorse for many years, was always solid as a rock (menubar is burned-in to CRT).
If the ROM chip somehow went bad, would I still get a solid screen? And how is the mouse/cursor working without any OS/driver?? Then there are the Bourns..... (BTW, I have Pina's book because I used it to troubleshoot Macs back in the day.)
Assuming RAM passes, what's the next step in boot process?
Thanks again - I'm stumped.

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