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
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