Can't communicate with iMac

My wireless trackpad and keyboard stopped connecting with my iMac, and the green light on each double blinks when I turn them on.  I can't log into my computer.  It seems perhaps the bluetooth has turned off, but I can't get in to check or reset it.  Rebooting, changing batteries on keyboard and trackpad didn't help.

Have you tried tapping the power button the keyboard and trackpad. Look in the manuals of eachf for instructions or you can find the manual by clicking Support in the upper right of this page then click the Manuals link. I was able to find the MTP manual at:
http://manuals.info.apple.com/en_US/Magic_Trackpad_UG.pdf
If this doesn't work then get any USB keyboard and use it.

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