Magsafe indicator faint/dim and blinking amber/green

I am working on a Macbook purchased in November 2008. Until now, no problems, but this morning after a full night's charge, I ran it for about two hours without being plugged in. When I plugged it in to charge, the indicator light on the magsafe would not light and the macbook would not take a charge. Fortunately, I had another magsafe power adapter, but this would also not charge the battery. I reset the SMC, thinking it was the cause of the problem, but still no luck with either adapter.
I went to the genius bar, where they plugged in my macbook with one of their adapters. Charging and startup. They recommended that I had a problem with my adapters, so I purchased an 85w adapter. I brought that adapter home and plugged it in macbook. Nothing. I went to my THIRD older magsafe adapter and when plugged in I got a faint/dim LED. Unplug, take it back to 85w. No light, no charge. Back to third, older magsafe and I get a faint/dim LED that flashes between faint amber and faint green.
The computer will not start up now even with the battery removed.
Thoughts?

Hi
The problem might not be with the adapters but with the power source. Try plugging in the charger into different wall sockets in the house. Try a friend's house too
If that still doesn't work go back to the Apple store with the charger and ask for help

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