Proliant ML350 G5 Lights code

I have an HP Proliant ML350 G5 server and after a regular shut down at the shutdown button, it didn't came back.

I haven't seen its logs for months, and I just have for now the front led panels:

The power button sometimes gets green, or amber.

The internal and external leds (those two next to the power button) were blinking red.

The other led was down.

I see there are one led on the motherboard that is amber, and the green (and only) button of the power was down. Where can I find a "map" of these leds? 

What can it be?

Thanks...