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High CPU usage on production server. Idle & wait % on topas are zero

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http://serverfault.com – This is my first question here and i may not be very well versed with AIX too. But neverthless i am trying to solve the problem at hand and this is what i am stuck with. We have an AIX 6.1 machine up and running. But the CPU usage as shown on topas seems to be always 100%. (user ~70% + kernel ~30%). The topas screen also shows the top CPU consuming processes and i saw that the usage was not actually that high from the processes. The output of ps auwx command seemed to show that all the processes used a normal amount of resources. The sum of CPU% of all the processes should not be more than 2 (HowTos)