Trying to fix Old Macbook
I tried to fix my macbook pro 13-inch (Mid 2012) 33 times but it did not work.
Earlier Mac models
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It is nearly impossible to help in this text-based setting if we don't know what problems and/or symptoms you encountered. Please add details
Did you try replacing the hard drive cable? That is the only weak point in an otherwise very reliable model. The HD cable is thin with very little insulation, With a few years of normal use and transport, the insulation chafes against sharp metal edges on the computer's chassis and can short.
HD cables for that model are available, cheap (under US$20), and user-installable.
A worn cable can produce a crazy array of very odd symptoms. That is why we need to know symptoms.
But at the point we neither know what issues you have nor what you have tried in the 33 times you fixed it. We may be able to help, but not with so little information.