LG 42PT85 tv not powering up

[sai2006]

When i switch the tv on i will get 3-4 flashing of green light and then it turn solid green for 1-2 seconds and go back to red, There is no sign of life on the screen within those 2 seconds.  I have visually checked the power board for capacitors and they look fine visually. Anyone have any ideas what could be wrong?  Any help will be appreciated.  thanks