I had the same issue with that model...I tried the SMC reset a couple of times did not work, until I removed the battery from the macbook. Once I had the battery off i held the the power button (drained the caps)
and replaced the battery and the power cord and powered the machine on. It booted up like normal. I did experience a few issues when the magsafe plug was removed abruptly, had to drain the caps again and the status indicator light would blink 6 times...once the battery was replaced all was well again.
apple measures the battery in cycles that battery was just used up...