how can i fix my samsung plasma PS50Q96HDX/XEU TV?

Mode no samsung plasma PS50Q96HDX/XEU serial no Z59N3SLQ100068W version SP09
There is no Picture and only sound the tv is only just 2 1/2 years old just switched on one day and there was no picture at all and when you turn it on the tv clicks on the light flashes as it is coming on but nothing deeply troubled by this as it cost me a £1000 and wonder how much to repair as out of warranty but not that long considering how much I paid you would expect a longer life