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there could be the following reasons.
If there is the red light on indicating the power reaching the TV then your power supply unit may be faulty. Open the back cover and look where the power cord goes and meet the components inside and it would also have a transformer like thing on it. This is the PSU module. If any of the capacitors is bulged or burst then that needs replacing with one of exactly the same specifications. Do that.
Second is that there is no indication of the power reaching the TV. In that case check the plug and the wall socket and also the power on switch on the TV. Whatever is faulty should be replaced.
Hi, there, pleasy clarify the following:
What is your Gateway model?
Is your TV an older tube type or a new HDTV? Does it have other input ports besides the standard cable input and the RCA you mentioned? You may be able to use S-Video if your laptop has the output port and so does your old TV. Or if you have a newer laptop that includes DVI and you have an HDTV, then you can use a DVI to HDMI cable which by the way will result in the best image quality.