blinking Caps lock and Scroll lock/ no boot up

   Hi,

I have an inspiron 9400 that has been having some issues lately.  As of right now, when I push the power button, the power light comes on but it does not boot or even post.  The Num lock stays on and the caps lock and scroll lock lights blink for about 40 seconds then the whole thing shuts off.  This can obviously be only a few things but, how to I figure out what those blinking lights mean.  I have search dell support but have found nothing.  Any help is greatly appreciated.

Thanks