M93p dual monitor problems; monitor turns off and cannot be turned on again

Hi,
we have multiple M93p tiny computers causing problems in dual monitor setup (VGA / Displayport->DVI). Our users (already >5)  keep telling us, they leave their workplace, return, then DVI attached monitor if off and they do not find a way to turn it on. This is true; the only workaround that has been found by our users is to bring Win7/32bit into standby mode and awaking it again.
Needless to say, we turned all windows energy saving options off (computer standby/hibernate, monitor turn off). Still the problem appears.
Maybe there is something wrong with DVI power/DVI signal?
- Monitor independent, as far as I can see
- Independent from Windows energy saving modes
- BIOS updates did not help
[todo]: Try Intel/(AMD?) drivers, let users test.
I haven't seen exactly when the monitor turns off because it is reported by users. I had a testing machine, but was not able to reproduce.
http://forums.lenovo.com/t5/A-M-and-Edge-Series-Th​inkCentre/Dual-monitors-problem-VGA-and-Displaypor​... is related.
Anyone?
Thx

Make a "Genius" appointment at an Apple Store to have the machine tested.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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