sony kv2972u. led B flashes 4 times led A 1 time, etc.

[viking-stu]

When i turn on my tv, it will some times come on other times not. ut it does the same ting regardless.....
Led B flashes 4 times
Led A flashes 1 time
Led B flashes 4 times
Led A flashes 1 time . then in to stand by mode.

if i try again, it will ether come on or repeat the process...

Can any one tell me what is wrong??????
Please help

Cheers
Viking-Stu