I had a failing power supply that was driving me crazy with random reboots all over the map.
Couldn’t figure it out until one day I noticed that just the action of opening an optical drive tray put the machine into a reboot.
The call for a little more power to operate that CD tray was too much for the weak PS, hence the reboot.
A new power supply was the fix.
a) Download and run Speedfan…see if your voltages are within 5% +/- (max)
Keep Speedfan open and observe it while you try to operate the drive.
b) Error reports…you might want to review these and you can also set the machine to halt on errors rather than restart as it seems to be set now.
Copied & pasted: (assuming you’re on XP)
It’s possible your system is encountering a fatal error and simply rebooting before you have a chance to read the error. Windows XP, by default, does this… which is really stupid!
You can set XP to halt so you can inspect any fatal/stop errors by:
- Right-Click on “My Computer” and select Properties
- Go to the Advanced and click the “Settings” button under the group “Startup and Recovery”
- Uncheck the “Automatically Restart” button.
- Click OK and keep clicking OK until you’re back to your desktop.
This will force XP to stop/wait on a fatal error rather than just rebooting. It will stop/halt and wait for you to press a key to reboot. This will allow you to reproduce your issue in hopes of seeing a blue-screen error and finding out if this is indeed your issue.
If after this your system is still just rebooting (no blue-screen error at all), chances are pretty good you have a power supply or cooling related issue. I’d inspect your power supply as well as case, cpu and videocard fans/heatsinks for built-up dust or if they are even spinning.
c) Common stop messages for reference: