Computer: Minitower, purchased from CyberPowerPC about 4 years ago
OS: Windows 7 Home Premium SP1 (64-bit) OEM, current with Windows updates (or pretty close)
Motherboard: MSI MS-7641 760GM-P34(FX) chipset SB750/SB710
Processor: AMD FX Quad-core 3.80GHz
Display adapter: AMD Radeon R7 200 series with 2G memory
Hard drives: Toshiba DT01ACA050 (C:, boot, 500GB); Toshiba DT01ACA300 (E: & F: partitions, 3TB); HGST HDN728080ALE604 (G:, 8TB)
Power supply: Thermaltake(?); unfortunately I cannot access the label with the wattage without removing the power supply, but the old one that failed last year was 500W and I'm virtually certain the replacement I bought was higher wattage.
Problem: My computer will, out of the blue, go into some sort of hibernate mode (without giving me a BSOD). It usually happens while I'm actively using the computer (often while navigating in Firefox). The display drops off, the same as if I had pressed the keys to lock the computer and put it into power saving mode, but nothing I do with the mouse or keyboard can wake it up, meaning no opportunity to gracefully save/exit any open applications. Once it happens, the only way I can regain control of the computer is to do a hard shutdown and restart it. Once restarted, everything works normally again aside from applications recovering from a computer crash. This first happened about 3 months ago and at first was weeks apart, but lately it's been happening much more often, 3-4 times per week.
I normally leave this computer running full time (with me not directly using it maybe 90% of the time), and so far there's only been one instance of it hanging like this while I was away from it, so there appears to be a correlation to it happening while I'm doing things at the computer, but it's not absolute. It happens at random; I have no idea what triggers the problem other than that it usually happens during the 10% of the time I'm interacting with the computer.
Thinking it might be the monitor, I tried plugging in a second one. The next time it happened, both monitors went down, so I doubt it's the monitor. I haven't ruled out the graphics card but don't know how to tell if that's the problem.
I also tried setting up TeamViewer to access and control the computer from my other computer. When the problem next occurred and I tried to start a remote session, TeamViewer hung indefinitely on "Connecting..."
There is evidence that at least some processes/subsystems on the hung computer still work. In particular, it has network drives that are still accessible from the other computer - I can navigate between folders on those drives and access files when it's in this hung state. In one case the hung computer was in the middle of a long-running process that should have eventually written a file to one of those drives, so I watched for the file, and it never appeared, so I concluded the process was basically screwed once the computer hung. It's as if the computer goes into some hybrid of locked, hibernated, and blue-screened.
The drivers for my display adapter are current as far as I know.
I run MalwareBytes AntiMalware Premium and Avast Free Edition, and neither has reported any malware issues.
I've run chkdsk (at least on the c: drive) and sfc /scannow. They didn't find any problems (or fixed them quietly if they did). The problem has reoccurred since then.
I've also run HWiNFO64 and while that problem provides more diagnostic information than I'd know what to do with, it didn't highlight anything as obviously wrong and nothing I could think to look at showed any problems (but I'll gladly take a peek at anything that may be relevant).
Following a couple of recent occurrences, I also looked in Event Viewer and didn't spot anything obvious, though here also I'm not entirely sure what to look for.
So, any ideas what the problem might be? What to check, any diagnostics I could run?
If something's failing I'm prepared to spend money to replace it, once I know it'll fix the problem. I really hate spending money on "try this and see if it helps".
SysnativeFileCollectionApp.zip 1.93MB 1 downloads