Both iMacs I own become unpaired upon occasion after powering up. If I didn't have a wired mouse / keyboard I'd be stuck. I have no idea why this occurs but have investigated numerous times. My internet connection is solid. This happens on both computers whether hooked through ethernet or wifi.<p>I've been considering an iMac replacement however I'd also have to buy adapters for my old wired keyboard / mouse as I use them to access and re-pair the mouse and keyboard when the problem occurs. Do you have any suggestions to fix the issue or ideas I might consider?