Trouble RB751G-2HnD

Hardware MikroTik hardware general
1

When the power RB751G-2HnD, Power LED flash and 1-5, with a frequency of 2 times per second.
What does this mean? And how to fix it?

2

Router no Ping, not detected on the network

3

Reinstall router
http://wiki.mikrotik.com/wiki/Manual:Netinstall