Hi,My name is Randy.I will assist you.Try the Power Button Lock on the Viewsonic: Press and hold  and the down arrow for 10 seconds. If the power button is pressed the message Power Button Locked will display for 5 seconds
. also check the display settings on your pc>
On the Change settings for the plan window, choose the display and sleep settings that you want to use.
To change more power settings, click Change advanced power settings .
Figure 5: Changing the display and sleep settings
Have the latest Adobe on my computer, but unable to open/view the full image or locate the correct model no to download a user manual
okay, try this download>
Many thanks Randy. Now have the manual and hopefully we can resolve the problem next week.