HD Install :: shutdown not umounting / (or /dev/hda2)

noob to this forum. i've searched high and low for reference to this issue.

Recently installed dsl, very impressed. on shutdown or reboot, last message is

can't umount /, (trying /dev/hda2)

then on the next start (or reboot) it goes into fsck automatically cuz / wasn't umounted properly

tried putting fuser -m / in powerdown.sh to find the culprit, but it references every pid left running...

don't know where to go from here, I've tried everything I can think of.

thanks in advance for your help

original here.