Macbook 2.0 intel core duo ALL KINDS OF PROBLEMS HELP PLS

This all started last week. In an effort to be more economical, I decided to keep my macbook and not get a new one. The battery was not doing well...so i bought a new one. I purchased Leopard and tried to install it...it installed but after it just stayed stuck on the gray apple screen. I tried troubleshooting. I reinstalled Tiger that came with it and it had the same problems. Anyways...a couple days ago I tried to reinstall Tiger again and it started working. I have been having problems with the rainbow wheel coming up all the time...so I figured maybe the ram is bad. I ordered new ram from crucial. I got it today and installed it and now the macbook will not even power up. I followed the troubleshoot guidelines and even installed the old ram again nothing.
So, I'm stuck. Is the logic board again? I had it replaced like 7 months after getting the macbook and now it is out of warranty. Please help. Thanks

Martin,
Since you say it worked to some degree but then not at all after installing new RAM and then after reinstalling the old RAM it would not even work as well as it had prior to the RAM installs, then it sounds like one possibility could be that the logic board is failing do to cracked circuit traces (caused by thermal cycling) and the removing and reinstalling the RAM exacerbated the problem.
The next thing I would try to do would be to cool down the computer to 50F or so and try it. Next try heating it up to 90F or so and try again. The temperature changes can affect a defective logic board. Not that this will solve your problem, but it can tend to validate the possibility of a defective board.

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Macbook 2.0 intel core duo ALL KINDS OF PROBLEMS HELP PLS

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