Tv takes up to 30 minutes to turn on

I have a RCA 42 inch HD tv . Good picture and all but it takes up to 30 minutes to come on. Any idea's

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0