Dear Srikanth,

you asked , "Is it likely to develop any problem or change its normal behaviour, if it is powered ON for a very long time(one month or more)? "

To put it shortly, the answer is a BIG NO to the above question ( meaning it will not develop any problem). Having said that, let me qualify the statement . The following IFs apply :

1. If the power supply is clean, stable, and within bounds always.

2. You have provided enough cooling arrangements so that the hardware stabilizes in its midband temperature range within a short time ( say 1 hour of switching ON ) and remains there, even when the climate goes through a spin.

3. Effects of noise on the hardware have been addressed and taken care of.

4. Failure mode analysis has been made and adequate safegaurds are in place to handle situations of crashed MCU, runaway code etc. If relevant a mechanism to trigger a fault alarm will be very nice in these situations.

The above are a few major points to note. But as is generally known, the worst time for any hardware is the power up time and thus the minimum number of times you do this the better. Just a simple statistics : All the total failures that I have so far seen ( audio system, TV, PC + Monitor to name a few ) have happened during power up. So I firmly believe that leaving a system on power for ever, if you take care of the above points should be beneficial rather than detrimental.

Raghu