Macbook pro turns it self off, wont charge battery, often wont boot.

Around June, after a couple months of light issues, my macbook pro basically just stopped turning on. I initially thought it was the video card, and since it was one of the earlier core 2 duo models, didnt think it was worth fixing. Just recently I happened to get the torx screwdriver needed to fully open the computer, and after not trying it for a couple of months, it booted up like new. At this time the battery appeared to be charging normally, but again something happened that seemed to coincide with my plugging a usb mouse into the usb port near the magsafe adapter, the light flickered and then it ceased charging. A little while later I was trying to move files off, and it shuts itself off. Then the same problem comes up while trying to boot it, typical noise, and then the apple screen comes up, and the picture is flickering and dims til its off again.
Since then the computer can be used for periods, seemingly doing better after its left off for hours at a time, but only for 30min-1hr max. the battery appears to not be charging at all, and the magsafe light, is either a bright green, or a dim green that has flickers between green and orange. If i press the button on the battery, no lights show up on it at all, and whenever the computer is actually on the batt. monitor says 0%.
The adapter, is in pretty good shape since I replaced it a 18mo ago, so I dont think thats the cause, the battery itself had very little life when it was running before dying in june, but Im not sure how a defective/dead battery could cause any of the other problems. I tried to reset the settings by removing adapter+batt. and holding power for 5 sec, but i dont see any effect.
Im clueless about troubleshooting macbook pros and laptops in general, though i would honestly think that the issue is basically due to the laptop not being able to be powered correctly, but after that I am lost.
any help would be greatly appreciated.

Hi W, and welcome to Apple Discussions.
Try removing the battery and booting.

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Macbook pro turns it self off, wont charge battery, often wont boot.

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