Macbook Pro has gone Bonkers


i have cmbp 2012. thing has run champ since august 2012 when got it, ive never had issue it, ever. ive had samsung 830 , 8gb of ram installed since practically day 1 well. 2 days ago, had tons of tabs open in chrome, doing thing usual, , computer crashed. got rainbow ball, , proceeded manually power down , restart computer power button. cut on, no apple logo appeared, not boot.

able boot diagnostic, though started , hung 12sec in, @ memory test, every time. when holding option key during boot, drive not there. able boot disk utility, wipe drive (it showed there), when go install mac os, doesnt detect drive, in fact hangs when computer detecting drives install to. tried reset pram , smc, nothing. took out ssd, put in stock 500gb drive, same thing. took apple, young lady of wasn't techie. able run diagnostic, , detected no problem of components. able os install on network. long story short, able install, performance unbearable. takes forever boot, nothing open , takes safari 7-10 seconds open, stutters when switching between tabs (3 open), mind machine quad i7 , 8gb of ram. when pressing keyboard or display lights takes second icons pop on display. tried resetting pram , smc again, nothing. whats wrong macbook pro?!
 

my first guess sata cable hdd/ssd. isn't typically problem in 15" models though.
 


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