Issue:
How to adjust the contrast on your Silcon UPS
 
Product line:
Silcon DP300E
 
Environment:
All Product models, all serial numbers
 
Cause:
Display may be difficult to read under certain lighting conditions

Resolution:  
If the display on your Silcon shows no values and you believe the UPS is powered, it may be a simple contrast issue.
To adjust the contrast of your display, Hold down the number 1 button while simultaneously pressing the up or down button.  This will cause the display contrast to go up and down.

The following video demonstrates this procedure: