I have very strange problem... first, some details:
- Windows 8.1 Pro
- motherboard: ASUS Z87-A
- Intel core i7-4770k
- CPU cooler: Corsair H90 (hydro)
- chassis: thermaltake mk-1
I've encrypted my system partition with BitLocker and when it asks for a password before boot the whole box shuts down (like someone pulls the power cable) for a couple of seconds. I can make my way to OS only by entering the password very fast, otherwise this "reset" occurs and I need to start over. If I go to BIOS after such "reset", I can see CPU temperature going down from larger values and settling at about 30C. So looks like this is overheating.
But I installed ASUS AI Suite to look at CPU temperature while running OS and I noticed that even when I run 7-zip benchmark (which is using all CPU cores fully) the CPU temperature never goes above 38C. And also in any case (in OS or not) the air that flows from inside chassis is cold (in every direction).
What may cause cooler failing before full OS boot, but not after? Is it a Windows bug, or it's my fault (bad cooler assembling and installing)? What can be done to save my hardware from possible damage from overheating and abrupt shutdowns?
I know only one trick so far, but not sure if it's really safe — set up another password in BIOS, so if PC is restarted when I'm away, it won't enter endless loop of (overheat, shutdown, start over). But it's annoying even in this case, and I'm sure it's not healthy for CPU, too.
Also I should note that when I installed cooler, I was struggling with it for hours and I accidentally massaged the thermal grease a bit before I was able to install it. (the thermal grease was on the cooler from the beginning)
But it this is the issue, I would have problems with overheating while the OS is running, too, right?
Maybe I should try updating BIOS? (I suspect it's dangerous process that can brick motherboard in case of accidental interruption)
Update: encoding lots of music with FLACCL (which uses OpenCL / runs mostly on GPU, which is inside CPU) also doesn't make any more heat. So seems like in OS the cooling works good.
Update 2: switched to self-encrypting SSD for system disk, arranged BitLocker to use this feature (instead of using CPU for encryption), but this problem is still there.
Update 3: I sold that computer, so I won't be able to test any other solutions…