CM500 blinking red lights

Hi, 

I have a CM500 Modem that is about 3.5 months old. Last week my internet suddenly went down. The modem has a solid green power light, but the up and down arrows continously blink red. When I plug it in it immediately starts blinking, it doesn't even attempt to connect. If I plug an ethernet cable in I do not get any signal from the modem. The cable company came out and confirmed that the modem was the issue. However, netgear insists it's not a hardware issue for the warranty. Any suggestions on how to troubleshoot?