Recently I've been noticing spontaneous reboots that don't have a BSOD (Blue Screen of Death). Generally this occurs when a problem occurs outside of Windows' ability to monitor it. From what I've noticed this can be either hardware problems or compatibility problems - but it's too broad of a category to generalize further.
The BSOD info is needed (if available) to shorten the troubleshooting process, but there's some common steps for each. Since both are generally hardware problems (whether it be hardware itself, drivers, or compatibility) the first step is to repair/replace the drivers. At times, stripping the system down to bare minimum will help to isolate the problem (and makes it easier to figure out which drivers to fix).
If not disabled, the BSOD will cause the Error Reporting Service to write an event to the Event Log. You can view the errors there (HowTo: http://www.bleepingcomputer.com/forums/t/40108/how-to-use-event-viewer/
Also, the errors are commonly saved in a minidump file on your hard drive (that's the default). Searching your hard drive for .dmp files should reveal them. Also, when the error reporting dialog pops up, click on the More Information and then on the Details link. This will show you the location of the files that will be sent to Microsoft - if there's an .mdmp file there, save it elsewhere before the report is sent. These dump files can be analyzed using the procedure here: http://forums.majorgeeks.com/showthread.php?t=35246
Then just post the results from it and we'll have a look at it.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
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