My computer's been acting strange lately, and by strange I mean it's been hardlocking on me. hardware: Asus Rampage IV black edition Intel core I7 3820 16 gigs RAM (4 x 4gig) Nvidia GTX 980 ti (hooked to 2 24" 1080p monitors) Corsair HX1050 modular PSU 5 harddrives (2 SSD, 3 data drives) 1 disk drive I no longer use but am too lazy to remove windows 10 pro (64 bit) When did it start: Not sure on exact moment, a couple of weeks ago probably. One day it was fine and the next it wasn't. No major windows updates/driver updates/hardware changes to my knowledge. What happens: monitors will freeze (including the little one on my G19 keyboard) and computer will no longer respond to any inputs. Sound keeps playing like normal for approx 30 seconds to 1 minute before "corrupting" (playing the last bit of sound in a loop, like a buzzing sound nothing recognizable). OR Computer will freeze for a couple seconds then reset itself. Nothing particularly interesting to be found in the logs. No BSOD or other error messages are given (eventlogs only indicate an unexpected Kernel Power event due to resetting), the computer does respond to pressing the reset button which is the only way to fix it. When does it happen: So far I've encountered 2 scenarios: I boot up a game and after a random amount of time (though never more than 10 minutes) the computer will hardlock. If it doens't crash in the first 10-15 minutes it'll be fine for the rest of the session, though scenario 2 might still occur. I'll play a game without issues, close it down and go do something else, mostly either youtube or netflix. After a couple of minutes the computer will hardlock. Both scenarios have the GPU in common, which is why it's currently my main suspect. Things I've checked/tried Voltages all seem fine according to Asus' AI suite (both at idle and under load the voltages don't move a bit) 12V rail sits at 12V dead (12.096V at idle, highest i've seen is 12.196 but only sporadically and only for a second ) 5V is at 5.04 3.3 is at 3.296 Vcore is at 1.275 Checked voltages in BIOS too but since there's no load this only indicates that voltages are fine when idling temperatures are fine (according to speedfan): GPU will get up to about 85-90°C before throttling starts CPU is high-ish but nothing concerning at 65 - 68°C (depending on core) all other temps are sitting at 30 - 35°C (harddrives, motherboard) So in short: no anomalies to be found. Ran Furmark for an hour, no issues (strangely enough) Ran intel burntest (for about 30 minutes), no issues Ran memtest (couple of hours), no issues updated GPU drivers CMOS reset Case is as clean as can be expected for a system that hasn't been changed in 3 years (last thing replaced was the motherboard and GPU). Drivers/BIOS: Motherboard BIOS is latest stable version 0701, only newer version is 0801 but that's been in "BETA" since 2014 and only unlocks support for 128gigs of ram GPU drivers are recent (391.35 from 2 months ago) since they're the first thing I updated when all this started So as i said my main suspect is the GPU but i'd like a second opinion on this. Maybe I've missed something or there's something else I can try before I start buying new parts.