Are all psychological problems only biochemical in nature or do some 'mental' components ( that is some form of conceptual 'conditioning' caused directly or indirectly or 'subconsciously' by the person involved), does this effect the development of an 'abnormal' behavioral pattern. If the 'mind-brain' is really just a 'biochemical' behavioral algorithm management mechanism then this would imply all 'mental' disorders are just biochemical mismanagement problems. So are all psychological problems only biochemical problems?
At some level, it's true that psychology reduces to biology and chemistry. If it didn't, then the widely-accepted view of physicialism/materialism would be wrong. But just because psychology can (in theory) be reduced to biochemistry, reductionism may not be the most productive way to approach the problem, for a couple of reasons:
The causes of psychological phenomena are likely to require such complex interactions at the level of biochemistry, that by the time you get around to explaining these interactions you're basically back at the level of describing the problem in terms of psychological constructs. Imagine trying to describe something like earthquakes using only concepts from quantum physics. It's theoretically possible, but not productive.
Psychological phenomena may have multiple ways of being instantiated. This is called multiple realizability. The key insight here is that two people may have thought processes that are very similar at a psychological level, but might be instantiated in different ways at a neural level. In such a case, the most productive way to describe the phenomena would probably be at the psychological level, since this is where the commonalities exist.