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What can be the reason for system freezes that are so "hard" that even the hardware reset button takes about 3 seconds until it actually resets the system (and then it actually powers down and up again instead of doing a "clean" hard reset like when pressing it during a normally running system).
Since it initially happened mainly while playing videos from YouTube I suspected the graphics card - however, I replaced it recently and it did not change it. It still happens from time to time (and sometimes more often, like a few times times in the last few hours).
The system is running Windows 7 - but I don't think this matters since I don't think any software, not even the OS, can actually affect the reset button's behaviour.
The PC is not overheated and the freezes happen randomly. There is also no malware on the system. The CPU is an Intel Core i7-920 on a Gigabyte EX58-UD5 mainboard.
What could be the cause for this problem? Faulty RAM? I did not run a full memtest86 check yet, but I wonder if there is a more likely issue than faulty RAM - checking 12G of ram does take some time after all!
There are no entries in the event log - but that's what I expected since the system freezes so hard that I doubt it has time to write anything to any log.
@ThiefMaster having the same problem. Trying to figure out the cause before I start swapping parts. Did you ever figure out what was causing it? – Codebling – 2016-11-18T03:38:27.873
Months later and still trying to figure out what the problem could be without replacing every component. @ThiefMaster did you find the problem? – Codebling – 2017-07-22T03:49:15.853
It's dead to interrupts, so you have to force power off (which is what happens if you hold the power key in for several seconds). Ie, something has trashed the central core of the OS. – Daniel R Hicks – 2012-09-27T12:07:09.680
Well, the reset key does work - with a few-second delay. Not reacting to interrupts sounds plausible though; the power-cycle-style reset that happens after the delay could indeed by some watchdog detecting that the system is not rebooting... – ThiefMaster – 2012-09-27T12:15:34.287
1No, there is hardware logic in the power supply that detects when the button is held in for a period of time and kills power. No software is involved. – Daniel R Hicks – 2012-09-27T12:27:46.370
Another possibility is that your power supply is marginal. This can cause hardware within the system, graphics adapters are particularly vulnerable, to hang or enter into strange states because they need just a little bit more power than the power supply is delivering. With video, stressing the adapter causes it to need more power. You may want to try swapping the power supply out with a known good one to see if that resolves it. – Yedric – 2012-09-27T12:29:57.267
To clarify, I do not have to hold the reset button pressed. I just press it once and then release it immediately. Regarding the power issue: There are no problems while playing HD videos (using VLC) or games with full details on 1920x1200 resolution. – ThiefMaster – 2012-09-27T12:31:47.993
If you press the button and release it immediately and the unit shuts down a few seconds later, that's presumably a (semi) normal shutdown. (It takes a lot longer than that in most normal cases.) The OS kernel may be discovering that something is corrupted/inoperable, rendering (fully) normal shutdown impossible. This could be a problem with the disk channel, eg, or corruption of the page tables, or corruption of the C drive master directory. First suspicion would be bad RAM. – Daniel R Hicks – 2012-09-28T23:47:52.163
(Your original post says "I don't think any software, not even the OS, can actually affect the reset button's behaviour," which is completely wrong. Initially the reset button only sends an interrupt to the OS, which should recognize the interrupt and initiate a shutdown, just as if you had selected power down from the Start button. Only if you hold the button in for several seconds does the hardware preemptively kill the system, without software assistance.) – Daniel R Hicks – 2012-09-28T23:51:38.540
@DanielRHicks: That's what the power button does. – ThiefMaster – 2012-09-29T00:03:48.773