A Ticking Noise Followed By Freeze

my pc developed this problem where there was a ticking noise from inside the system, followed by the whole system freezing. initially the system froze momentarily, but later onwards it became more and more permanent. we took it to the repairman and he fixed it, saying that there was a "corrupt file" in the system. no such problems emerged after that.two weeks later i heard a faint ticking noise, but the freeze was permanent, and it came while i was watching a Internet video. after the freeze ended, a notification came up from chrome saying that shockwave had become unresponsive. i didn't take that much notice of it then..then around a week later, the same old problem came up, and this time, it became permanent as well. the repairman is puzzled and refutes my idea that it's because the hdd is going for a six. he still thinks that the old corrupt file problem is to blame.can anyone enlighten me how this ticking-noise-followed-by-progressively-permanent-freeze-up problem can be explained. is there more than one reason? is there any reason other than the corrupt file and hdd break-up?