ESX Node in Stand by mode

I have very basic knowledge on VMWare. We have ESX 4.0 with 2 ESX nodes. One being switched off. I had an alert "Host Connection state" that i double click to get details but instead it changed one of the switched off ESX nodes to Standby mode. This is live environment and i want to revert things back as they were.
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Can you take a screenshot of what you're seeing so I can better assist you? I assume you're seeing this when you log into vCenter with your vSphere Client? When you log into vCenter, take a screenshot of what you're wanting help with. Thanks.


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When you mean standby mode do you really mean maintenance mode?  Just choose exit standby mode.
Usually host connection state means something's gone wrong network wise - check out that side of things (you don't provide enough details for us to provide instructions).
I really fail to see the point of having two ESX servers - and then one switched off - there's no redundancy.  
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