My Macbook Pro 2011 wont boot properly. only when batter is disconnected. HELP

hi all.
i have recently bought a macbook pro, 2011 i5 4GB knowing it wasn't fully working, but i need some help.
when i try and power it on, nothing happens at all (it did turn on once for about 10 seconds, then shut itself down.) i have since been playing around with it, fault finding, and i have found out that if i have the battery disconnected, and have it connected to the charger it works! (if holding CMD+D.) i have tried running the hardwear test, but when holding down the relivent keys on startup it just continues to load the OS X as normal. i do not have the start up discs either. im not entirely sure where to go from here, id love to know what could possibly be causing this fault. any help would be greatly appreciated. thanks in advance.

Update - I've got it all powered up, updated etc. it only doesn't start now after a forced shutdown (holding off button) if I press shutdown, restart etc it works fine. Really want this sorted, any help would be greatly appreciated. I'm ripping my hair out! Thanks

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    Mac OS X: Gray screen appears during startup - Support - Apple
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