In the manual there is a list of 3 digit preset codes for different brands. I use to have my DHT-500 hooked up to a Sony TV but have recently brought a Dell 17" Flat screen monitor/TV that I have set it up with. There is however no entry in the list for Dell products. I have tried putting in a number of different codes from other brands but no luck. Does anyone know if Dell products have such a code? I have contacted Dell support but whoever logged my case didn't seem to know.