Routerboard doesn't boot

I’ve been using the RouterBoard 750G for a whopping 3 days now as it is my first one. I ordered four of them. I opened three of them. Two are working. The third I’m not sure what’s wrong. When I plug it in, the “3” light remains lit and just sits there, like it doesn’t actually do a proper boot. I’m not getting an IP from the DHCP on ports 2-5 either. I held in the reset button while plugging it in and that didn’t seem to do the trick.

Is something wrong with the Routerboard by chance or is this something common that can be fixed? Thanks a lot.

Sounds like it is broken, contact your reseller.