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Dell boots up but then goes immediately into safe mode--can't wake

We recently had a complete power outage which may have caused this problem but the Dell was protected by a Tripp-Lite UPS. The Dell was properly turned off while protected by the UPS and then the UPS was turned off and unplugged.

When I have the Dell attached to the UPS the Dell boots into Windows 7 (Prof) but in less than 30 seconds goes into Power Save mode. It will not wake from Power Save when pressing any keys. I have to do a hard shut down for it to boot up again. It opens in Safe Mode but after about 10-15 minutes will go to Power Save mode. Opened the case and the fan on the video card would no longer spin even when connected to power. (NVIDIA GeForce 9800 GT) Switched with an identical known working video card and that fan works. Just to test the UPS I unplugged the Dell from the UPS and plugged the computer into a grounded outlet. It boots up and I checked power settings in Control Panel. The Power & Display is set to always be on. I ran multiple Windows software updates. However, once I connect the Dell to the Tripp-Lite it returns to Power Save mode after booting up.

The UPS appears to be fully charged and works fine when I have monitors plugged in. Any thoughts on why the Dell goes to Power Save mode when attached to the UPS?

Dell Precision T3500, Intel Xeon CPU, 2.93 GHz, 12 GR RAM, 64 bit

Tripp-Lite UPS OMNI900 LCD

Отвечено! View the answer У меня та же проблема

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Sorry, the Dell boots up and goes into POWER SAVE mode.


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Выбранное решение

Your UPS may be putting out the right voltage or watts to power up the PC. It's possible that when the power came back on after the power outage, the relay / switch that switches the UPS from AC to Battery may have sparked when the power came back on. This would cause the relay / switch to burn and not permit proper connection. Sort of like a bad spark plug.

Try testing the outlets of the UPS with a proper tester and check for any voltage drops or spikes. Also try only plugging the PC into the UPS and connect the monitors to the wall outlet with another Surge Protector.


I would even test the power supply, Voltage Diagram via the link....

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Thank you for the reply! The outlets tested fine and the UPS tester said battery was good. I allowed it to charge 24 hours. I found an application for the Tripp-Lite UPS called "PowerAlert Network Shutdown Agent Software" that is free. Works on Windows and Linux. Had to connect the UPS and computer with an additional USB cable. From the PANSA user's guide:

"PowerAlert Network Shutdown Agent (PANSA) monitors one or two network-attached Tripp Lite UPS systems for specific power events, takes the appropriate action to preserve backup power, and protects sensitive equipment from damage. Example actions include shutting down the computer receiving UPS backup power when the UPS enters a low battery condition or, in a VMware application, signaling an ESXi Host to shut down. If the ESXi Host is a member of a high availability cluster, the desired response to the low battery event could be to shut down the virtual machines running on the host before shutting down the host itself."

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