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oh, I just realized mine actually has the tantalums in place. definitely a rev.B so nevermind 

also, would it be a good idea to populate all these empty 47uf spots on the board or is that left empty intentionally?

well no, I just got exact replacements for all of the axials and went with that. could that even possible be the culprit for this? I feel like this is a more serious failure than buggy performance, the problem really is I'm getting NO performance at all. still no raster, still no post, still no...

Every cap is replaced,  one leaked ave lifted a pad with it so I had to bodge the trace.

I've tried it with no ram too, no death march and the same spastic drive operation. That's why I think maybe I need one more rom to try

It is plugged into it's own card

slightly off topic, here's the whole system. once the machine is actually working I'm going to be doing a video on it. I've been dying to get this actually running for weeks now.

oof, that's a relief, I almost bought some of that accelerator ram to stick in this machine to try

https://www.ebay.com/itm/Vintage-Lot-of-Four-Matched-Macintosh-IIfx-64-pin-Memory-RAM-SIMMs-/142733529056?_trksid=p2047675.l2557&ssPageName=STRK%3AMEBIDX%3AIT&nma=true&si=aTR1mBUWB7IgvcqePg0hWy3aFrA%3D&orig_cvip=true&rt=nc . here's what I bought. the seller was *mostly...

the board was one of the last off the production line and never actually used in a machine, so I'm assuming this is the latest revision. I don't know how much I wanna put this thing through a vigorous wash, as much as I don't have a problem with washing boards, I was really banking on this...

yea two new batteries are in there, this actually came with its factory batteries completely intact. I rushed them out and got these in here. again the board was totally clean and pristine as I received it. a minute ago I discovered one of the caps I replaced had a lifted pad and broken trace...

no raster, no chime, still not getting anywhere, I'm gonna start reflowing pass-thru legs that may have gone cold because until I get more ram to play with I can't really do anything 

It did exactly what it's doing now before I replaced anything 

I just got my hands on a new IIfx upgrade board (not the one that just sold on eBay for 600, I actually lost that) from an old Apple dev I met on Facebook. The thing was pristine but of course I recapped it to eliminate variables, and after getting all the parts together it's not booting...