perc amber led blinking poweredge t140

Hello, my server does not turn on. when I turn on only the fan and the power supply sound for 3 seconds and then it stops after that the lights on the MB are:

PERC_LED = 1. green static led/2. green led flashing/3. amber led blinking.

It was fine a few days ago and now it doesn't want to turn on. I already changed the position of the ram.

please your kind help