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If your computer unexpectedly resets or shuts down then check out the possible causes and solutions below.

Run WhoCrashed

First run WhoCrashed, it will tell you if crash dumps are enabled for your computer and if any crash dumps were found.

Crash dumps are disabled on your computer

If your computer suddenly resets or shuts down without showing any blue screen, it may be that your system is not configured to write out crash dumps in case of a system failure. Check out the topic below on enabling crash dumps.
If you run WhoCrashed and click the Analyze button, it will tell you if crash dumps are enabled for your computer or not so that's an easy way to find out.
Check out the following article to enable crash dumps on your computer.

Crash dumps are enabled but are not written

If WhoCrashed reports that your system is configured to write out crash dumps they are not written out and don't appear then there may be another reason why crash dumps are not written. Check out this article for possible causes and solutions.

In case you are you sure that your system is capable of writing out crash dumps and displaying blue screens and they still don't appear but you are experiencing sudden resets or shut downs then check out the topic below for possible other causes.

Your system was overheated

If one of the temperature sensors in your system reaches a temperature trip point, your system may reset or shutdown immediately. Fans may be clogged up or you have inadequate cooling. This is a very common problem. Check out the topic thermal issues for causes and resolutions.

A hardware failure

A hardware failure could not be caught by the operating system and brought down the system unexpectedly. This may be very difficult to track down if there are no crash dumps available. In any case make sure your system is configured to write out crash dumps.

Power failure or interruption

You may be experiencing a power interruption, instability or a have a faulty power adapter. A UPS may help you in this case.