Apple IIe sooms to work but gives no picture on TV
Yesterday I received an Apple IIe that I have bought on ebay for a bargain of £20 (it was being sold off on behalf of a large company that was getting rid of all of its Apple II computers).
I switched it on and it seemed fine (made beeb noise), can respond to keyboard commands (it beeps when you press return).
But I cannot get a picture on my TV. I have connected the TV to the plug that has a picture of a monitor/TV set).
I have gone up and down on the tuning manually (as autotune usually whizzes straight past computers) but still no picture!
When I tune the TV to around 31-32 UHF I can hear a loud humming noise through the TV, and this noise stops when the computer is switched off, so obviously something is being transmitted to the TV, but not a picture...
When opened all of the insides look fine and the computer itself is in good conditon and seems to have been looked after.
Does anyone know what could be wrong with it?
I would really like to get it going again, these things are getting rarer and rarer and I am sure that you will all agree that they are a big part of computing's history.