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If you noticed a sudden slowdown then that points to an event of some sort that is likely pointed to an issue with the HDD (IMHO). Mac OS is very sensitive to issues with the speed of the disk, which is why it benefits so much from upgrading to an SSD. My recommendations? Back up your vital data now. Boot the system into recovery mode, run disk utility to ...


Warning: before trying my solution, ensure you have a complete backup of your hard drive (usually Macintosh HD) Before trying the method below, try the following: Open Disk Utility (booting to Recovery Mode by holding cmdR while starting your Mac, select Disk Utility in the OS X Utilities menu) Select your main volume (usually Macintosh HD) Select First ...


Click the + sign at the bottom from the list and choose Wi-Fi in the drop down menu that appears.

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