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Correct, 3400 does indeed use ATA.

I've made progress with Diagnostic mode, it indeed reports an issue with the SCSI Bus. So my guess is probably a bad solder joint or failed SCSI Controller IC (NCR 53C96) - Incidentally, if anyone has a battery bombed board with a NCR 53C96, please hit me up! Diag mode test results Test...

This is quite funny because I just found it on one of my PPC upgraded Quadras today as well. I may compare versions between yours and mine and if they're different, I'll upload mine too. EDIT: Looks like they're the same!

Yep, already done that - mentioned it earlier in the thread.

SE/30s have always had yellow/amber LED's in my experience. Mine has one, although it hasn't been lit in around 23 years as my father swapped out the SCSI drive for a much larger one that didn't have a header for the activity LED. SE and 20SC's yeah they had red ones. Personally I like to go...

Righto, apologies for the massively delayed follow up. @quorten, thank you for your input, your recreation of the SE schematic has been very helpful. So far I think I've been able to verify that RDQ0 to RDQ15 have continuity between the LS245s and the BBU. You mentioned regarding RDO13? Was...

Yes, it's attached. I could swap it with a known good one from my other 950, just in case it might've failed. I guess I could probably test this myself, but by your suggestion the 950 won't get to the flashing ? floppy icon if nothing's connected in either SCSI connector?

Hmm, yeah. The more I think about it the more I feel it would be a SCSI issue. I'll see if I can take a look at the SCSI related IC's under the microscope and see if there's any cracked solder joints. Might give diagnostic mode a try too. Okay, U43 and U48 are 53C96 SCSI Controllers - One for...

Hey all, I recently got a pair of Quadra 950s, initially both ran just great, but one soon developed a fault. The machine chimes, completes the RAM test and loads up video, it looks like it gets to just the point before it initializes the toolbox, and then just hangs. The grey screen still has...

I would definitely like to note down my interest for one of these. These cards are unobtanium so a clone is most welcome.

IIRC the SE/30 utilizes the onboard RAM SIMMs to draw the video buffer, problematic RAM has been known to cause graphical issues. I'll admit I haven't seen it quite this bad, but as far as troubleshooting goes, I'd start with that. I would also try and grab a schematic of the board and trace...

You're braver than me, those things are like made out of glass at this point. I'll be curious to see what condition this shows up in. Best of luck!

Well, I'm back from my vacation, and unfortunately bad news. My IIfx is insta-death chiming again. It's literally been sitting on the side for 2 weeks not doing anything and it was in its semi-working state before I left. So I've no idea what's causing this. I think I'm gonna try bodge-wiring in...

Oh never mind, just saw DarthNvader's earlier post on changing the clock speed here: https://web.archive.org/web/20000418021913/http://www.bekkoame.or.jp:80/~t-imai/ilcpce1.html - Thanks again!

Okay, I'm back from my vacation and installed a 300Mhz card I got from eBay which appears to work. So I guess my original card is toast, and 350Mhz replacements don't seem to easy to get. Does anyone know the process of modifying a 300Mhz to 350? From what I've heard it appears possible?

Sweet, thanks for confirming that! At least we know the CPU card is compatible. :) And thanks for the link, that guide was a very interesting read.

The machine is badged as a 9600/350 and the card is branded as a Mach V and the computer identifies itself as a 9600 with a G3 card in it. I'm not at home right now to double check the board. I'll report back on that. I will say, it may be an early 9600 board as it doesn't have soldered ROMs on...

Yup, I've tried that. No go sadly, also used some deoxit on the contacts and the slot. One thing of note the first time using it, the startup chime sounded pretty garbled with static, but thereafter it sounded fine, but still nothing on the screen. I hooked up a serial cable to see if it was...

I think it's definitely worth trying the BlueSCSI as it seems to operate in a way that the IIfx prefers. The kits can be obtained for $25 and fully assembled is $50, so not a huge gamble to see if it improves things, plus they're handy to have anyways. I also heard from another poster that any...

I've found the Sync-On-Green to be a major headache when trying to use any non-Apple CRT...to the point that none of my non-Apple CRT's will sync with my IIci & IIsi. With LCDs on the other hand, I've found that almost all of them seem to be okay with the SoG, so if you want to validate the...