Netgear RN204 NAS set up and firmware.

Thanks for the replies Sand-shark and Stephen B,   So,  yesterday I tried a factory default again and still having an issue.  

To answer the question on the static vs DHCP...it is DHCP on the older one and I am assuming this one... .it did give me a IP with the end numbers being .181  For safety this morning I shut down the older one and fired up the new one (The one I just put the drives in) and fired it up...  for some reason I am not getting the log in screen and when I put in the Ip address it shows that the device is empty (I think)  I tried the Netgear web log in  but it comes up with something completely difference and does not have anything about the NAS,  I can not get it to the setup page at all. I can not see firmware version.

So since  I am paranoid about keeping the original NAS with with lots of files on it... I am trying to be very careful and not wiping it out.  I turned off the new unit, unplugged it from the network and turned my original back on.... when it came up it had a new IP address changing from .35 to .48 though....  My Plex server is working and I can get in to the NAS as before  so... that is good...but it's strange it gave me another IP address.... 

So, do you think I should just do a fresh factory install?  I have the latest firmware downloaded and unzipped on a flash drive. and I am assuming I'd do that off line with out the Ethernet cable connected....

I'd just like to get this NAS up and running to add to my Plea set up..but I don't want to do anything to disturb my working system that has 10 years of files loaded and running.  

Thanks again for the suggestions.