i have a hardware test failure 4sns/1/4000000:idor-0.040
4sns/1/4000000:idor-0.040 this is the hardware failure code. Any idea's? it started to make a noise top left hand corner of macbook. at times it gets hot and the fan turns on. i updated it to o s x yosemite.
MacBook Air, Mac OS X (10.6.7)
