Can't find nas after reboot

After copying files from my 4tb mybookliveduo to a new nas that i built,  I no longer have access to it after I rebooted it. No ssh, dashboard, or network connections are being made to it. I can’t find it on my network.

I have unplugged it, rebooted my routers and still nothing.

Any suggestions? Thanks

Hello, have you tried pressing the reset button on the back of the My Book for 4 seconds? 

Not yet, will it delete any files?

I pressed the reset button, now the light is yellow, what does that mean?

It usually means that its network connection isn’t functioning. Check the ports and cables.