2001 nissan quest video switch
 

any help will be appreciated if any body could tell me how can i turn the video on in my 2001 nissan quest. my tv screen is on the ceiling of the van inside. i have a power switch next to the video cassette inserter which is located in between the two front seats. i pressed the power button and tried, but it just wouldn't turn on. i checked the fuse box and fuses are just fine. now i do not know if there is another switch that i should turn on before pressing the power switch in the video box. or don't know what to do. any help will be appreciated. thanx in advance.