my hyundai 42" plasma will not turn on?

i have a hyundai hp4200 plasma when i switch it on it the green L,E,D'S in the back come on then 4 secounds later a red L,E,D with alarm written underneath comes on and it cuts out i have managed to get it on the past with a hair dryer blowing the back i read some where it may be a moisture switch but have not been able to get it on since it was last turned off it was working fine when turned my skybox off it would go in to stand by and come back on once the sky box had been switched on but an unsuspecting guest went and switched it off at the front any ideas?