Computer can't recognize wireless keyboard

When I turned the computer on today, bluetooth just suddenly won't recognize my keyboard.
I tried Bluetooth Keyboard Assistant, and it says "No keyboards have been found, please make sure keyboard is "discoverable".
I just replace the battery, nothing changed.
I restarted and restarted and kept getting the same results (the machine searches for the device and returns with a "no keyboards found, make sure keyboard is discoverable".
This Mac and keyboard is new, just over 2 months old.
My bluetooth mouse is working fine and appears on the bluetooth devices list.
Just somehow the keyboard mysteriously disappeared.
Anyone have a clue what's happening?

I tried that. If I repeat this process enough sometimes bluetooth finds it, but when I type the passkey no., it cycles through the same "please make sure your keyboard is discoverable".
I'm searching the forums and it appears this Mac wireless keyboard/bluetooth is a chronic problem.
Indeed, this Mac bluetooth is *t .

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Hi, can someone help me how can i connected my multimeter to my pc with rs232, because my computer can´t recognize the device, i mean the multimeter, is a multimeter keithley serie 2400, and i already downloaded all the drivers for labview even the VISA

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Marco,
Here are some suggestions:
1) Check the manual the Keithley manual to see how to configure the RS-232.
    On some models you need set Factory defaults to USER and turn on the RS-232.
    Also there may be a setting for SCPI which you want on (probably on by default).
2) On your PC - open Device Manager. See if a COM port exists and is functional.
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      You can set the COM port parameters by right clicking and selecting Properties.
     (On some PCs the onboard ports can be disabled in the BIOS)
3) If step two was OK, open MAX (Measurement and Automation eXplorer).
    On the left side, click on Devices and Hardware.
    Click on Serial and Parallel.
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    Open a VISA Test Panel.
    Now I don't have one I can look at right now, so this is general idea:
   Configure the COM port to match the Keithley settings (should be OK if step 2 worked)
   Go to the (I think) Input Output tab (you want to send a command)
   The command string input should already have a *IDN? entered, if not, type it in.
   Click on the Query button to send the command and check the response.
   If you get an ID string back (Company name, Model, FW Version ...) then it works.
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steve
Help the forum when you get help. Click the "Solution?" icon on the reply that answers your
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I have iMac and I try use my keyboard for apple TV 3. Apple TV 3 can't recognize my keyboard when I try found my keyboard in Apple TV 3 Bluetooth settings. Do anybody knows what is problem? I try disconnect keyboard from iMac but when I turn on keyboard it automatically connect to iMac because iMac is in Bluetooth range of keyboard when it is in my living room (where is my apple tv). Also, I try shut down iMac but without success.
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Delete programs you never use.
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Device Clean Boot
=================
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Computer can't recognize wireless keyboard

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