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The problem looks like a mainboard problem if you have checked all the cable connections going from your source to the projector.If you are yet to confirm the cables, then u should try to check the connections by putting a spare VGA / video cable
You can connect it directly with a composite cable. There would be a RCA(yellow) video output on the back of your cable TV. This is then connected to Video input(yellow) f you projector.
If your cable TV has Component output (threr RCA cable Green, Red, Blue), then these thre RCA could be connected to the similar one available on your Projector.
You could connect your sound als o thru the RCA out of Cable TV and input of Projector. But if you have a good AV Receiver or a sound system then it best suited for it, since the projector speaker is mono and only 2Watt output.
Let me know if there are any specific inputs required The Dell 2200 mp projector has the following compatibility :HDTV: 1080i, 720p EDTV/480p: