IBM TransNote Hardware Maintenance Manual page 70

Note: Be sure that connectors and cables are properly
housed in the slot as shown in the following figure.
Otherwise, the card cannot be seated firmly in it.
After installing the Mini-PCI Card, attach the black sheet to
the card. If the sheet does not stick to the slot on the video
card, just leave it and install the Mini-PCI slot cover not to
pinch the cable or the black sheet.
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ThinkPad TransNote
Removing and replacing a FRU