After having successfully removed/reattached the ribbon cable several times while trying to revive this computer for back-up use the securing/release tabs on the connector broke. The connector then will not hold the cable properly and connecting fails. Tried various methods of propping the cable in the connector to get full contact but eventually all efforts failed, too. Result: essentially a dead motherboard as no replacement for the connector seems available. Sadly, not worth the extra effort to try further repairs.