phillips magnavox 52" projection problem

i have a 9 r  10 yr. old magnavox 52 " projection screen that i bought new an hasn't been used much at all n 2 yrs. an went to turn it on today an the power light comes on an the light blinks when changing channels an changing volume as it always has but i get no audio or video total dead screen anyone had this problem or no what it could be thanks