I have macbook pro 15" mid 2012, i am trying to run the Apple hardware test but it freezes after 1 sec, & then even it can't be stoped , also restart & shutdown buttons didn't work i have to ultimately manully restart the machine.I madeNo hardware Change.

I have macbook pro 15" mid 2012, i am trying to run the hardware test it loads but as i presses test the macbook freezes, it even did not responds to the the STOP , RESTART or Shudtdown buttons then. I have to manully press the power button to shutdown the macbook then.. Note: i did NOT made any hardware or ram change, however once i have performed this test after buying and completed successfully.

I have install all the updates but still its not working .. Thanks , It will be great to hear