Attention : this maybe not the solution for most of you. This is only a specific case happen to me that i want to share. So maybe there's another user have the same case.
So today i got weird problem after power failure. When restart my imac , the keyboard cannot be connected. After replacing the keyboard with my pc -usb keyboard, i can get into the login window and type my password. I checked the bluetooth is working properly, the keyboard can be recognized but the pairing process is never succeeded. I try to google all the solution on the net and all are not working with me. after hours struggling with the problem, i suddenly remember that this morning i turn on bluetooth on my android phone … wait , you may think, what does that phone have something to do with my mac keyboard? ( i use samsung galaxy s2).. well i remember that i install some app in my phone which has the ability to connect to my mac-keyboard. So this is soooo stupid, i didn't realize it that every time i turn on my mac , it can't get connected to my keyboard for sure coz my android phone has taken over it. So while it's connected to my phone , there's no way my imac can connect to it. And the problem is there's no clue that my keyboard is connecting to which or what device. I almost throw out my keyboard. Also i'm thinking something silly, let say i bring the keyboard to check to other mac, it will always fail if my android phone is in my pocket (there still in range for bluetooth connection distance , right ?) , if i bring to service center , they will have problem at all to connect to their mac while later when they give back my keyboard , it won't work again. So i simply turn off bluetooth on my phone then restart mac. After pairing to my keyboard , i can use my keyboard as usual :-) .
Sorry like i said , this is not a solution for most user who experiencing the keyboard connection problem, it's just for sharing my case. So..watch out your other device near you that may 'hijack' your keyboard :-)
Thanx,
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