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Oct 10, 2015 10:19 AM in response to Loner Tby @1979,It boots up correctly, but I only get a blank blue screen with no menu bar and no desktop. I can open iTunes with F12 and from there open recently opened applications only.
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Oct 10, 2015 12:47 PM in response to @1979by Loner T,★HelpfulCan you try Resetting the System Management Controller (SMC) on your Mac - Apple Support and test?
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Oct 10, 2015 12:48 PM in response to @1979by @1979,- Thank you for the suggestion Loner T, but it did not work. Any other ideas?
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Oct 10, 2015 1:35 PM in response to @1979by @1979,No, Unfortunately, we don't have a wired keyboard and mouse. We only have a bluetooth keyboard and mouse for that computer. All other computers are laptops.
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Oct 10, 2015 1:41 PM in response to @1979by seventy one,Can you try your keyboard on another computer, say a friend's. Is there any connection light showing? Are you sure the batteries are of good quality, not picked up from a dime a dozen store.
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Oct 10, 2015 1:43 PM in response to @1979by Loner T,Do you know how to use Target Disk Mode using a second Mac? Please see
Share files between two computers with target disk mode - Apple Support
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Oct 10, 2015 2:01 PM in response to @1979by Loner T,Try pairing the keyboard to one of the laptops and test the Keyboard.
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Oct 10, 2015 2:11 PM in response to seventy oneby @1979,We don't think is the keyboard. We think a button on the keyboard was held down while changing the new, quality batteries.
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Oct 10, 2015 2:40 PM in response to @1979by seventy one,Can't imagine how that would have occurred. What brand of battery are you using. Were the old batteries in a poor state. Did you clean out the battery compartment as best as possible, particularly if the old batteries had
corroded. Do you have a steady green light?
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Oct 10, 2015 2:57 PM in response to seventy oneby @1979,We don't think is the keyboard. We think a button on the keyboard was held down while changing the new, quality batteries. When it first opens, it is a blank blue screen and if we press the F12 or F11 or click mouse, sometimes it opens iTunes. It seems to vary each time. Still, there is no menu bar, just the iTunes menu. If we click within the iTunes window, the menu comes up at the top of the screen and the Apple icon shows on the far left. When we can get to the Apple icon at top left and through Recently Opened, System Preferences or About this Mac, we seem to be going through a workable back door, but it is inconsistent. Also, we can get into some settings but can't change them. (We used Energizer batteries.)
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Oct 10, 2015 3:01 PM in response to @1979by Loner T,Unless you have sticky keys on the keyboard, or bad keys, it is unlikely. Did the previous batteries leak inside the keyboard?
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Oct 10, 2015 3:08 PM in response to @1979by seventy one,I have to ask the obvious to determine if it is the keyboard. Has it been exposed to dampness or a liquid spillage?
The F11 and F12 keys are only related to iTunes for sound purposes. Energiser batteries should be fine but you need to test the keyboard with a different computer to see if the problems are consistent. You say you don't think it is the keyboard, but all the problems point to it. And you still haven't answered if there is a steady green light or there was any sign of corrosion from the previous batteries..