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When working on an SLT/286, I found that an import CF adapter would prevent it from booting, to the point it wouldn't even start the memory test.
Troubleshooting steps included removing the CF card, unplugging power from the adapter, and finally unplugging the adapter from the ribbon cable.
I took the adapter to the bench and started probing it and comparing against the IDE pinout. I found that pin 28, SPSYNC:CSEL was permanently connected to ground in the adapter.
I've worked out enough of the pinout to get the laptop running with a third party power supply. I don't have a good battery, so I wasn't able to really determine what the battery sense terminals do, or see what things look like when charging. I can dig in a little later after I build a replacement battery; a project for another day.
In the image you can see the pinout looking into the computer. These are the male pins.
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