Wireless Keyboard sends wrong data/gibberish to Mac

My wireless keyboard began sending random commands to my computer. Think- typing one character and three appear in a screen field; sends commands (keystrokes) to fields; and, starts activating other systems features. What I have done: replaced the batteries; deleted bluetooth keyboard and successfully re-synced three times - resulting in the same problem. No keys are stuck, not liquid has been in contact with the keyboard, etc. Apple has replaced one keyboard already due to the same situation. Other Info: Apple Bluetooth Software Version 2.3.1f4,Bluetooth PAN:
Type: Ethernet
BSD Device Name: en2
Hardware (MAC) Address: 64:b9:e8:de:c8:2a
IPv4:
Configuration Method: DHCP
IPv6:
Configuration Method: Automatic
Proxies:
Exceptions List: *.local, 169.254/16
FTP Passive Mode: Yes
Guidance would be appreciated. This is my first post - apologies if it is too detailed

Hi, first I would replace the k/b batteries. 2nd I would go the SMC route. 3rd I would delete the k/b from your BT set up, then do a clean setup. Check to see if there are any pertinent Updates & Repair Permissions. After that you could try a USB k/b if that works I would suspect your BT k/b...L

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[shameful mode on]
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[shameful mode off]

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There are easily hundreds of variants of the iMac dating back to 1998. Many of the pre-2006 iMacs this forum covers cannot support an Apple wireles keyboard. Because this model has been in production for so long, it is important for you to let us know as much about your computer as possible so someone won't give you information that may not be appropriate to your iMac variant.
So we need to know:
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2) The make and model of the keyboard.
I asked for your Mac OS version because "iOS" as currently shown in your equipment profile cannot run on any Mac computer, only Apple's mobile devices. Once you get the OS version from "About this Mac," please change your profile to avoid further confusion and get help faster without the delay of someone having to ask for clarification before they can start helping.

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<Post Relocated by Moderator>

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Hi Saint Anne,
Happy Thanksgiving Day! Since both of your wireless input devices are not working at the moment, do you have a wired mouse you can use to straighten this out? Here are some troubleshooting steps to try:
Wireless Connection issue
Make sure Bluetooth is turned on
First, choose Apple () menu > System Preferences > Bluetooth and confirm that Bluetooth is turned ON.
The Bluetooth menu bar icon should turn:
Black if Bluetooth is turned ON and no devices are connected.
Light grey with three dots if Bluetooth is ON and at least one wireless device is connected.
Light grey (or disappear completely) if Bluetooth is turned OFF, or if the iMac is unable to communicate with the Bluetooth module.
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Bluetooth OFF
Bluetooth ON and connected to wireless device
Bluetooth menu icon
Bluetooth status
Bluetooth turned on, but there are no devices connected to the Mac. See the "Make sure the wireless mouse or keyboard is turned on" section of this article.
Bluetooth turned on and at least one wireless device is connected. See the "Make sure the wireless mouse or keyboard is turned on" section of this article.
When this icon flashes, at least one wireless device has a low battery. Click the Bluetooth icon to identify the affected device, then replace the batteries.
Bluetooth is off. Click the Bluetooth icon using a USB mouse and select "Turn Bluetooth On". Note: Mac OS X won’t allow Bluetooth to be turned off unless a USB mouse is connected.
Bluetooth offline. Restart your Mac. If the Bluetooth status doesn’t change, disconnect all USB devices and restart your Mac again.
Make sure the wireless mouse and keyboard are turned on.
Mouse
Slide the On/Off switch on the bottom of your mouse to turn it on. Note: If the battery compartment cover is not installed properly the On/Off switch may not function correctly or may be difficult to operate. Remove the battery compartment cover and carefully reinstall it.
When your mouse is on and paired, and the batteries are charged, the indicator light glows steadily.
If your mouse isn’t paired with a Mac, the indicator light will blink, indicating your mouse is in discovery mode and ready to pair.
If the indicator light doesn't illuminate, check to make sure you have two good batteries and that they're installed correctly.
Keyboard
Push and release the On/Off switch to turn on the Apple Wireless Keyboard.
When your keyboard is on and paired, and the batteries are charged, the light will glow steadily for several seconds, then turn off.
If your wireless keyboard isn’t paired with your Mac, the indicator light will begin to blink. This indicates your keyboard is in discovery mode and ready to pair with your Mac.
If the LED doesn't light up, remove the batteries to make sure they're good and that they're installed correctly.
Check preferences
From the Apple () menu, choose System Preferences, then choose Bluetooth from the View menu. The Bluetooth preferences pane will list the Bluetooth devices paired with the computer, the status of the devices (paired or connected), and whether Bluetooth power is on or not.
Click the gear icon and choose "Connect" to connect a device that is powered on.
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Check for signal interference
Wireless networks that operate on 2.4GHz may cause interference.
Move cordless phone base stations, microwave ovens, and other 2.4GHz electrical devices away from the Mac if you suspect interference.
Keep wireless devices within 10 meters (33 feet) of the Mac.
Avoid putting metal objects between the device and the Mac.
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For mice that have a scroll ball, refer to How to clean your Mighty Mouse.
Check the Scrolling speed slide-control at the top, and make sure the “Scroll” checkbox is checked.
For scrolling side-to-side, make sure the application you’re using supports side-to-side scrolling.
Remember, scrolling is done with one finger, and navigating is done by swiping side-to-side with two fingers.
Navigating moves from page to page in a document or internet browser unlike scrolling.
Mouse does not track as expected (jittery, jumpy, slow, fast).
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Choose System Preferences from the Apple () menu, then choose Mouse from the View menu. Set the Tracking slider to adjust how fast the pointer moves as you move the mouse.
Try using a different surface to see if the tracking improves.
Turn the mouse over and inspect the sensor window. Use compressed air to gently clean the sensor window if dust or debris is present.
If multiple Bluetooth wireless devices are in use nearby, try turning them off one at a time to see if the issue improves. Bandwidth intensive devices could affect tracking.
Mouse buttons do not work as expected.
The Mouse preference pane allows users to customize the mouse features to meet their needs.
Choose System Preferences from the Apple () menu, then choose Mouse from the View menu. Set the Tracking slider to adjust how fast the pointer moves as you move the mouse.
Try using a different surface to see if the tracking improves.
Turn the mouse over and inspect the sensor window. Use compressed air to gently clean the sensor window if dust or debris is present.
If multiple Bluetooth wireless devices are in use nearby, try turning them off one at a time to see if the issue improves. Bandwidth intensive devices could affect tracking.
Keyboard has one or more keys that do not respond.
Use the Keyboard Viewer to test whether the keyboard keys are responding correctly when they are pressed.
Choose System Preferences from the Apple () menu, then choose Language & Textfrom the View menu (or International from the View menu in Mac OS X v10.5 or earlier).
Select Input Sources.
Select the Keyboard & Character Viewer checkbox.
Enable the input source for the keyboard layout you are testing by selecting the checkbox next to it.
Make sure that "Show Input menu in menu bar" is enabled.
Choose Show Keyboard Viewer from the Input menu in the menu bar, as shown.
The Keyboard Viewer shows the keyboard layout.
Type the key on the keyboard that doesn’t respond and observe whether the corresponding key highlights on the Keyboard Viewer. If it does, that particular key is functioning correctly. In the sample shown above the shift and command keys are being pressed.
If the mouse keys feature in the Universal Access System Preferences pane is enabled, many of the keyboard keys may not respond as expected.
Try starting up into single user mode to determine whether a software issue is causing the issue.
Cheers,
Judy

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Hi...
You actually provided the solution yourself. Or rather the workaround.
Wait for login screen to show before turning on wireless devices.
I asume you are seeing a grey progressbar during boot when you have this issue.
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It's a known issue. Search for grey prograssbar in the forum.
/Dennis

Wireless Keyboard sends wrong data/gibberish to Mac

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