2011 MacBook Pro-Sleep light blinks 3 times, doesn't start

Hi there, I was just given a 2011 MacBook Pro 15'-8GB RAM, 2.2Ghz...the medium spec'd model if I am correct. It worked fine for a little while, but now whenever I plug it into power, it does one of two things. Either it attempts to come on, hard drive spins up...and then the sleep light flashes 3 times and it powers down. OR, as soon as it gets plugged in it powers cycles indefinately until I unplug it. The sleep light comes on for maybe a second, and the hard drive spins up, then it shuts back off and repeats this until I unplug it.
Nothing has been changed from it's stock configuration to I am relatively sure that it isn't a simple RAM problem.
Any help is appreciated.
Please note that I have already tried things like clearing the SMC and reseating the RAM.

Means bad memory.

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Edwin,
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Regarding your storage space check out the following:
HD Space Checkers:
Disk Inventory X (FREE)
WhatSize (SHAREWARE)
OmniDiskSweeper (FREE)
GrandPerspective (FREE - donation)
Mac Performance Guide
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===============
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