As the subject states, i found several devices connected to the Microtik can no longer received Internet signal via the Ethernet port (the Netgear wireless access point, the Apple TV, the Emac, and the Blueray player).
I forgot to mentioned that the sad part is the Apple TV, the Blueray player, and the Emac were powered off. Also, I had tried to upgrade the Microtik RB450g to OS 6.0rc12 and had actually uploaded the file which didn't install when I reboot. The Ethernet ports on the Microtik seem to be dead too.
No one has some answers or an explanation of what could have happened? The router seems to connect to the Internet on the Eth1; however, none of the other ports are connected despite being able to logged-in the RouterOS through Winbox.