This is because you have yet to properly format the drive and set it up for your NAS to use. You’ll see this sequence of lights only when the system has a new drive that is not formatted, or has an improper format. Try logging into your unit using the default credentials, and you’ll see it brings you straight to the Storage > RAID tab. Configure your new drive(s) as JBOD (if single drive) or RAID (if you have two of them), allow the NAS to format for a few minutes, and you’re done; the lights will all switch back to blue.