We have a new Dell PowerEdge T110 running Server 2008 Datacenter R2 Sp1 that is rebooting at random times. Symptoms: The server reboots at different times during the day at least once a day. There is no blue screen or error in event viewer prior to reboot. There is only the Kernel-Power event stating that the server rebooted unexpectedly. Troubleshooting steps already taken: The server passes all hardware diagnostics. We have run chkdsk and sfc. The UPS the server is attached to is new and load is at 5-7%. The server is the only device plugged into the UPS. We have tried running the server off of the UPS and it still reboots. The server has the latest drivers and updates. I've uninstalled all non-critical software. The server has an external hard drive for backups. I detached the external hard drive and problem persists. The server does not have any other peripherals. I have run a Windows repair and the message returned is that no problems were found. I'm stumped. Any help would be appreciated.

Similar thread http://social.technet.microsoft.com/Forums/en-US/winserverTS/thread/490a03c4-4f54-479d-b03f-d03e02403674Thanks, Santosh (MCTS W2K8 AD and SCCM) To Infinity and Beyond

Hello, refer to that: http://support.microsoft.com/kb/2028504 This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner 2010 / 2011 Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows 7, Configuring Microsoft Certified IT Professional: Enterprise Administrator Microsoft Certified IT Professional: Server Administrator

Hi, What related error message can you read in Event Viewer? Based on the current situation, please test the issue in Safe Mode, Clean Boot and Device Clean Boot. Please press F8 when starting the server to boot into Safe Mode. For the detailed steps of how to enter Clean Boot, please refer to the following Microsoft KB article: How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7 http://support.microsoft.com/kb/929135 To perform a Device Clean Boot, please unplug all unnecessary devices to test your computer's performance. In this situation, your system will only have the basic hardware devices and it should be more stable. If it is inconvenient to unplug the devices, we can disable them in Device Manager. Please refer to the following steps: 1. Click "Start", type "DEVMGMT.MSC" in the Search textbox and press Enter. Please click “Allow” if the User Account Control window is prompted. 2. Expand "Sound, video and game controllers". 3. Right click on your Sound Card, select "Properties" 4. Click "Driver" tab, click Disable (Disable the selected device). Click OK. 5. Please use the same method to disable other hardware such as: Modem, network card, CD-R drive. Please note some devices such as video adapter are not available to be disabled. Then, restart your computer. Does it still crash now? If the system is stable, we can re-enable the devices one by one to narrow down the root cause. If it also works normally in Clean Boot, you may perform Step 2 to Step 7 to narrow down the possible cause. What are the results in these three modes? Regards, Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Unfortunately, we can't run the server in safe mode for a long period of time because it is in production. While troubleshooting, I unplugged the UPS from the wall and the server immediately powered off. There are no outlets on the UPS labelled "power surge only." At this point, I think the UPS is bad even though it passes self-tests and the building is having power issues. Right now the server is plugged directly into an outlet on the other side of the room. It has since rebooted again. No other devices or computers in the same outlet have had any problems. Is it possible the server is highly sensitive to voltage changes? Any suggestions? The server is still under warranty but it passes all hardware diagnostics.

Solution: Dell shipped us the server with the power supply set to 230 volts. We switched the server to 115V. This should fix our problem. I hope this helps someone in the future.