Wireless keyboard won't turn on after changing battery

This is what happened:
I got a message yesterday telling me that the battery for my wireless keyboard was low and I should replace them. This morning, before I switched on my Mac, I put in new battery for the wireless keyboard. Then I switched on my Mac. And I got a message on the screen saying that There's no keyboard connected and couldn't find any keyboards. I thought that maybe I need to turn on the keyboard to make it work. So I pressed the power button and noticed that the green light doesn't even come up..
What's going on? Is my wireless keyboard already dead??
Any advice would be appreciate it. Thanks.

Possible fix to non pairing blue tooth devices.....
I have a BTMMouse- quite new. The original lithium batteries died and I replaced them with alkaline. It would connect but refused to pair. Went on the MM discussion board which had over 300 similar problems with both MM and BT keyboards, with absolutely no solutions from Apple or anyone!
I have an Apple Care plan, so I called and was told to shut down. Then remove the power cord from the back of my iMac, wait one minute, plug it back in. Fire up, and then attempt to set up a new device in BT. It worked on the first try. Then to double check, I shut down and restarted and the mouse stayed connect and paired!

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