ViewSonic VP231wb display and macmini

Hello!
I have an user who recently bought a viewsonic VP231wb. He also bought more recently a mac mini. When connected with this dvi display, after a while the monitor simply shutdown. I went on the user's site and changed the resolution to the maximum. Nevertheless, when the mini goes to sleep, the monitor shuts down. So, you have everytime to power up the display again. Any clue how to get out of this situation?
Sorry for the lenght, but here are the tech specs for the display:
LCD PANEL Type 23" Colour-TFT-Active-Matrix-LCD-Display
Display Area 49,5 cm horizontal x 30,9 cm vertical, 58,4 cm diagonal
Optimum Resolution 1920 x 1200 @ 60 Hz
Pixel Pitch 0,258mm
Bandwidth 165MHz
Contrast Ratio 500:1 (typ.)
Viewing Angle 176° horizontal, 176° vertical (@ 10:1)
Response Time 16ms (off-on-off) (typ.), 12ms (grey-to-grey)
Colour Support 16.7M colours (8-bit)
Brightness 250cd/m2 (typ.)
Glass Surface Anti-glare
Backlight Life 50,000hrs
VIDEO INPUT Analogue RGB Analogue (75 ohms, 0.7/1.0 Vp-p)
Digital DVI-I (TMDS, 100 ohms, or analogue capable)
Frequency Fh: 30-92kHz, Fv: 24-85Hz
Sync H/V Separated, Composite, Sync on Green (TTL)
COMPATIBILITY PC PC and compatibles (from VGA up to 1920 x 1200)
Mac®1 Power Mac™ (up to 1600 x 1200)
Thanks
Claire

I have a Power MacG5 behaving exactly the same way with a large Westinghouse (LCM.22W) LCD Monitor. The problems began when I decided to enable the sleep function to save electricity. For years it worked fine and the sleep problems into an unwakable black screen started on and off with me doing the same to remedy it: restarting or unplugging and replugging the DVI 400 cable (Monster Digital Video)from the CPU DVI port. Now nothing works as a remedy. I have no alternate monitor to use to access the CPU. Now when I reseat the DVI cable the monitor says check connections indicating it isn't hooked up to a DVI output video source even though it is.
I'm starting to wonder if the problem is the G5 video card in the CPU and not the cable or the monitor since I'm not the only one who has experienced the problem with a large monitor when the computer goes to sleep and the monitor shuts down.

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