Rca television model 24v412t- or 25v511t

standby powerlight is on,turn on the t.v.,gives out the usual start up hum,light goes out ,tv does not come on.standby lite returns to glow,and then slowly fades out.TV,will not come on,by using remote,nor the power button on the tv itself.I was working fine this afternoon(2-23-08).This tv is new in my 07 Jayco Eagle,purchased 6-1-08.It is only 7 months old.
Any ideas whats wrong with it?I do not have access to the rear of this set,it is in a enclosed compartment.I do beleive it is still under warranty.
Thank You,Sincerely
Maynard J Henning