However, when I install the SSD on the mac the problem occurs again. I also, tried booting up my mac with the external bootable SSD drive using SATA to USB cable and it works perfectly fine. The SSD is working fine, I tried it on my sisters MBP 13" mid 2012 and it was working perfectly fine. tried system preferences and set Startup Disk setting to be SSD-tried internet recovery and it failed after painfully waiting for 5 hours. tried creating an external bootable drive by installing the Mac OS on the SSD using SATA to USB cable tried installing a fresh copy of Mac OS from a USB stick and external hard drive. tried cloning the factory drive to the SSD using Carbon Copy and I have reset PRAM. After the bootup is complete it takes few minutes to load up the mac OS interface and Once I'm on the mac OS interface everything is so slow and sluggish, whenever I moved my mouse or even open a folder or anything my cursor keeps on turning into a colorful spinning wheel. when I turn on my macbook, halfway through the bootup loading screen it shows a "Prohibitory sign" ( which means a valid start-up disk has not yet been found), after a few minutes the screen shuts off then turns on and displays the loading screen and continues to complete the bootup. However, my macbook is acting wierd with the SSD but not with the HDD. I've done tons of research before I proceeded changing my MBP drive with an SSD. I upgraded my MBP 13" mid 2012 with a Samsung 250gb 860 EVO 2.5" SSD. Macbook pro SSD upgrade acting weird and super slow? HELP!
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