My DSL-G604T router suddenly started flashing leds ininterruptl

Hi everyone! I got a problem with my D-Link DSL-604T ADSL modem router. Suddenly, after a climate storm the device enter in a LED flashing light which wasn´t occurring before. This is the second time I got this. That happened wiht other Dlink modem Router before. This one still working with WIRELESS COMMUNICATION, B U T no more wired PCs can access the Internet. The PC says "... Lan cable not connected. Please verify your cables...
I powered off the routers many times and for long time period, That still happen. I switched the cables from different RJ45 router ports and I also removed the DLink switch box in the middle I had. Seems that everythink stays the same. Can ANYONE HELP ME PLEASE. Any clues or suggestions what this may be..... Regards LUIS