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It does the same thing.. left it for ages.. Still square grey screen with no mouse pointer.

Here's a video of what it's doing.. I replaced Q1 in the adb circuit but it does the same thing with or without Q1 even being present.

Ahhh darn these schematics.. thanx

I've found a transistor in the ADB circuit thats corroded away, schematics says it's a MMBT2904, I can't find any for sale.. Does anyone know what a suitable replacement would be?

Thanks for all the advice, at least I've a starting point where to look. Cheers

Tried both ram banks.. 4 of the 8 simms were giving death chime so swapped em all around to check all the slots worked with the good ram. I tried a bmow rom simm and same thing. I dont even get a mouse pointer or rounded screen edges.. i waited 10 minutes, none of the ics are getting too hot.

It does the same thing with or without a hard disk or bluescsi connected to the internal bus. I dont have anything connected to the external scsi.. dont know how picky the iifx is regarding termination but its not even getting to the question mark or rounded corner screen.

Yeah I tried a radius 24 and it hangs on the radius splash screen.

Recapped and powered up.. happy chime then stuck on a grey screen with square corners.. hmmm

I've always thought this would make a great machine.. I might give this a go too if I can find a 630 board.

Yep 😂 sorry.. sometimes I type how I speak.

Looking more complete..

The case gets a good clean..

Good tip with the caps.. was thinking of fitting 25v caps to be sure. Today I got the shielding out.. that was a job n arf 😦

More progress.. fitted logic gates for the power on circuit.

Messing with macs is keepin me going lately.

Yep same process here too..visual stuff first.Then deductive reasoning.. 😃 what Ive got left.. if any 😂 I'm taking my time cos it's a IIfx.

I thought I'd start a thread about my IIfx as it's gonna take a while to fix with lots of photos. Today I repaired a few vias under one of the batteries.

@cheesestraws Yeah I really wanted the weird ROM disk thing