help please with my monitor?

hello members'
would some kind person point me in the right direction' on my Sony PFM-42V1N 42" Plasma Television monitor
its funy because it turns on' but thiers no screen shown' ie picture.
inside there are 3 fans and none of them are turning.
when i open'd the case i noticed that two capacitors had gone, one 47uf 250volts and one 33uf 250volts, so i changed those two electrolytic capacitors, but still no luck.
any ideas please will be wellcome on fault finding.

many thanks
basic