Macbook Pro lags and freezes

[faceofjock]

I have a serious problem with my MacBookPro 9.2 mid 2012.
it worked very well until i connected an iphone to it , the finder has blocked 2 times and i was obliged to do a force shutdown.
I can not use it without blocking, always freezes even if it is an i7 with 8GB of RAM.
I tried :

• reseting NVRAM ,
• reinstalling the OS(mavericks and mountain lion , it takes hours because of freezes)
• Formating the hard drive completely.
• Clean install but the problem still exist, is it a hardware problem?
• Apple hardware test says 3 times there is no errors.
• Installed Mountain Lion , still freezing but less than mavericks

Please help me , i can't work anymore.

 

[shazeal]

Sounds suspiciously like a Hard disk failing. If you had a spare 2.5" disk/ssd laying about I would see if swapping it out fixes the problem.
If not you could check the smart status and see if it's "Reallocated Sector Count" is more than zero. I use DiskTools Pro to check it, but there may be some other free tool to do so on OSX I am unsure.

It could well be something else however. Definitely a hardware issue though if it persists after clean installs, and exhibits the behavior while installing.