Windows 7 Win7 x64 crashing, no bsod or memory dump written


Extraordinary Member
Aug 11, 2009
I have a Win7 install - clean install, about 6-7 months old. Only being used for work purposes (web development) no gaming anything like that.

Randomly as far as i can tell, my computer crashes. There's no bluescreen, no error log. The only thing to indicate something happened is that fact that everything I had open is closed and if i look in the event log there's an error 'previous system shutdown was unexpected' and a critical 'the system has rebooted without cleanly shutting down first...'

I ran the perfmon report and the only thing odd in there is it says there's no virus protection even though i have MS sec essentials running with real time virus protection turned on and virus def's are up to date. Although i see there's a hotfix available for this so i guess this is a known glitch in the report.

This has never happened while I am using the PC which is really strange. It usually only happened when I left the PC on over night. It just crashed now while I was out to lunch. It just seems very strange that it only happens when the pc is sitting idle.

I also ran the online virus scanner from trend micro a few weeks back while this was happening and it found nothing.

I have system recovery set to write a kernel memory dump - there's no memory dump file when this happens.

Since this sort of feels like the power is going out since there's no log written and no BSOD,
I thought this might be due to a bad PSU, so i swapped that out for a new one to no effect. I also have a UPS (CyberPower CP600LCD) hooked up to the computer so this shouldn't be due to any temporary power glitches. Even if the power does go out the UPS should cleanly turn off the PC. I tested this by pulling the power chord from the wall and the PC shut down after a minute. The monitoring software from the UPS shows nothing wrong.

Right now the only thing i can think of is something malicious/funky is running or the UPS itself is bad and glitching out. It just seems very strange that this has never once happened while I'm actually using the PC but only when it's been sitting idle. The only thing I have installed which usually runs while it's idle is mozy backup (aside from whatever typical window's processes run in the background). And that's only backing up about 300meg worth of files, most of which don't change.

Anyone have any ideas?

Win7 x64
16gb ram
120meg ssd
nvidia gt 630
latest windows updates installed

It seems like you've already taken several steps to troubleshoot the random crashes on your Windows 7 system. Given the symptoms you've described, here are some additional steps and considerations you could explore to further diagnose and potentially resolve the issue:

### Power Related Issues
1. Power Settings: Check your power settings to ensure that the system isn't going into a hibernation or sleep state that may be causing the crashes.

2. Hardware Testing: Run hardware diagnostic tests to check for any issues with components like RAM, SSD, and GPU. Windows Memory Diagnostic Tool can help with RAM testing.

3. Heat Management: Ensure that the system isn't overheating. Check the temperature of your CPU and GPU during idle and load. Use tools like HWMonitor to monitor temperatures.

### Software Related Issues
1. Background Processes: Monitor the system for any background processes that may be causing the crashes. Tools like Process Explorer can help identify resource-intensive applications.

2. Event Viewer: Dig deeper into the Event Viewer logs to see if there are any other recurring patterns or errors leading up to the crashes.

3. Driver Updates: Ensure that all your drivers are up-to-date, especially GPU drivers.

4. Windows Update: Sometimes Windows updates can introduce new problems. Consider uninstalling recent updates to see if the issue is resolved.

4. Malware Scan: Run a thorough malware scan using trusted antivirus software to rule out any malicious software causing the crashes.

5. Mozy Backup: Consider temporarily disabling Mozy backup to see if the crashes stop. It's possible that some interaction with the software is causing the issue.

### System Recovery
1. System Restore: Consider performing a System Restore to a point before the crashes started occurring to see if that resolves the issue.

### UPS Related Issues
1. UPS Configuration: Double-check the UPS configuration and connections. Ensure the UPS is functioning properly and hasn't encountered any issues.

### Additional Steps
1. Hardware Reset: Perform a complete shut down and unplug the system from power for a few minutes. Then, restart the system and check for stability.

2. Advanced System Tools: Use tools like Sysinternals Suite to delve deeper into system processes and troubleshoot any underlying issues.

3. Kernel Dump Configuration: Verify that the kernel dump configuration is set up correctly.

In addition to the suggestions above, periodic monitoring of the system under different conditions might help in identifying patterns that lead to the crashes. Let me know if you need further assistance with any of these steps.