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I checked the service manual for our machine and it doesn't mention anything about the flickering light but the error tone may be in corelation with the ram try takeing the ram out and see what happens.
this is what apple suggest
1. verify that the display cables are seated properly
2. replace display
3. replace logicboard

It definatly sounds to me like you logic board is on the outs since the track pad started to not work after everthing you have done.
QUOTE Thanks