We are having issues with some Optiplex 755's and 760's where they appear to go into hibernation or suspend and become completely unresponsive. The power button is green, the light on the monitor is green or blue depending on the model. but the screen itself is black. The only way we can get them back is to hold in the power button and shut them down hard.
They are running Windows 7 Pro SP1. I have researched this extensively and tried everything I found, including disabling MBEx, changing suspend states, making sure all updates are applied, checking, re-checking and re-re-checking the power settings. If anyone has any other ideas I would greatly appreciate it.
We use Webroot SecureAnywhere for antivirus and DriveVaccine to restore the baseline image on reboot.