Sega 32x passthrough works but 32 bit cards don't

Question

I have a Sega 32x that I bought off ebay as not working.
I have tried it in a Megadrive Genesis, with and without MegaCD and also in a Megadrive II with and without MegaCD.
Passthrough (with Genesis games) works fine.
I have three 32x Carts (Starwards, Virtua Racing and Doom) and none of these work.
The Sega copyright screen appears but then nothing.
I have cleaned and tested continuity on all the connectors and also on the white ribbon cables.
Everything seems fine.
Any advice?

Mark Mills · Answer

Ok - so it appears to be related to cleanliness of the contacts. I cleaned them with contact cleaner but I think this has some detergent in it - I've now cleaned them with IPA and it's working fine.

Sega 32x passthrough works but 32 bit cards don't

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