Backup not working

I am having this same problem, though mine started even before the firmware upgrade. I had to shut down the NAS and my PC during the middle of the week due to a power outage. When I powered back up, none of my backups would work. No change in path, no change to the main PC. Same error "Error connecting to //computer/folder". Changing backslashes did not work, adding a username and password from the PC did not work, upgrading to new firmware did not work. I can connect to the same share from any other PC. Could the problem have to do with the NAS hanging on to an old DHCP IP address for the PC, and not letting it go? That's the only thing I can seem to guess that would coincide with my power down/power up.