WD-52525-No picture

Reaching out in hopes someone else has run accross this problem..  I have had this TV for 3 years with no problems but today I go to turn it on and it says Check connections or power-RGBHV or YPrPb may be invaild.  I have not touch anyhting or changed anyhting for this to happen.  I also don't get a picture on the DVD or game icons in the menu, I have checked the cable box on another TV and it works fine..  I'm stumped and hpoing someone knows whats going on.  Thanks for any help-Kyle