BUSH 37" HD LCD has trouble stating up?

I turn on at mains, the standby light comes on, press power on remote (or on the tv itself) nothing seems to happen then after a couple of seconds it returns to standby. I repeat this process about 6-10 times, then i get sound but no picture, I try a few more times and finally it comes on and functions perfectly. Its only 18 months old and becoming really frustrating. Any help would be greatly appreciated