Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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MacBook Pro - apperently broken. Working, but very slow.

I bought Macbook Pro 13 v.A1278 apparently broken. Not starting, CD stuck inside, I just saw bootcamp / windows trying to run in save mode.

When managed to eject CD windows started. I did not see mac partition, than I cleaned up the disc and installed Mountain Lion, but it was extremely slow.

I replaced RAM (4GB) to check if it's a problem, it did not help.

Cleaned the disc again and installed Lion from USB. It's running 3 times faster but still very very slow (like windows XP after 3 years of using)

I run disc utility, verified/repaired disc it was looking ok.

Battery seems to be untouched but it's not charging, iStatspro showing battery health nan% cycles 0, charge nan%, charge bar showing 80% charged.

What can be broken? if any..

How can I check what is the problem

Is there any diagnostic software I could install and run?

Any other steps I should undertake?

In Mac service, they are useless they said motherboard is broken. I do not believe that. (When I gave them my other old Mac with faulty/broken graphic card they said the screen - which works ok - should be replaced, so Mac service is not an option)

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I know this may sound crazy but I had two of these in last week. Both were fixed by replacing the hard drive cable with new cables. Note replacing with used parts did not do the job.

MacBook Pro 13" Unibody Mid 2009 Hard Drive Cable Replacement

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Jerzy Smetana will be eternally grateful.
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