GLSL programs varying result?

I have written few GLSL programs and i tested them on Radeon 9500 cards and they all seem to work fine giving the results as expected .
But when i tested the same programs on ATI R420 cards, i dont see any output on the screen ?

I checked the logs and it states shader linked successfully and will run in hardware.
What could be the possible reason for this varying output ?
Any hints , comments ?
Thanks in advance.

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