According to the Wiki
alternating blue/yellow means that no DHCP server is found. Your wireshark log says the same. The box is assigning itself an APIPA address (169.254.228.103 in this case), but first it checks if no-one else is using that address already.
You have 3 possibilities. For some reason your DHCP server (the router, in most cases) doesn't assign the NAS an ip address, or the receiving line of the NAS network interface doesn't work, or somehow the firmware got damaged in that way that it won't accept the assigned address.
You can assign your PC an address in the 169.254.x.y/16 range. The NAS should be accessible at 169.254.228.103. (But that could change at next boot). If that works, have a look at your router and NAS network settings. If it doesn't work, check your cables, and/or try another port in the switch/router.
As a last resort you could reload the firmware (Installing firmware on a new disk
). If you omit chapter 8, Data Partition, it should leave your data.