Hmm, correct me if I am wrong, but doesnt almost every OS require you to have the bootable partitions on a primary partition? I see that you are using 6-9, and I do know that 1-4 is primary and 5 on is extended partitions. That could be the problem right there.
But as to your detective work -- try changing it to 6, it may help. I would presume that it is referencing hda5, since that is the extended partition (6-9 are partitions within it). PErhaps that will do the trick.