Hello everyone, i'm having a big problem. Yesterday I put my ASUS K56CM laptop running Windows 7 to defrag my C disk over the night. In the middle of the night, I woke up and my laptop was making weird ticking noise, at about 2-3 second intervals. I also noticed that my HDD stops spinning for about 0.3 seconds and spins up again. I tried to put my laptop to sleep, the screen blanked, and blue screen occured. I shut it down completely and left it for the morning. In the morning, I pressed the power button, the big ASUS logo popped up (as always), and screen said failed to boot. I tried changing the priority but it didn't work. Later, I opened my computer's back, unscrewed the hdd, and put it back again. This time it booted up into windows, but froze after the desktop loaded and was making that ticking noise. I shut it down and put away, now asking for help, because I don't know what to do next. My computer specs: Intel Core i7 3537U 2-core, 12 GB RAM DDR3, Nvidia GeForce GT 635M, 500GB WD Blue HDD. I bought it 4 Months ago. Sorry for bad english, I'm from Lithuania. Please help, I'm desperate!