I was out of town for a few days, plugged in my NetBook and couldn't reach the drive...looked at the unit and noticed main square button power / reset / indicator and right HDD LED blinking in harmony. The left HDD was not blinking. The other DNS units on the network were OK.
Could not reach the Admin Page. Unit did not respond to several reset attempts. Unplugged the power at the DNS unit - not the power adapter - let it sit for 1 minute and plugged the power back in. Pushed the main square indicator button / switch and unit went into a normal start up process; went back on line...worked for me.
Thanks for the tips - they may not all work for all situations, but in this case yes.
Firmware is 1.09, installed a few months ago.