volvo242gt,

Out of curiousity, when you were testing the board without the ROM SIMMs, you did have the jumper installed next to the SIMM slot, right?

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When I tested the logic board without the ROM SIMMS I did have the jumper installed next to the SIMM slot. With the IIci ROM selected I don't get a chime when I turn the Mac on.

genie_mac,

there seems to be a lot of corrosion around D8 (component labelled A6, a high speed diode IIRC). I suppose it's time to get the multimeter out and start checking for continuity, shorts, opens etc.

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I have been checking the continuity for all the components within the area pictured. D8 is quite corroded so I scraped some of it off so I could test continuity. My multimeter beeps so it must be OK!

Also, I have been testing continuity between ROM pins and vias on both sides of the logic board. They all check out!

I don't know how test for shorts and opens with a multimeter but I'll soon have a look.

Thanks for all the help!