Try disabling the lock by pressing and holding [1] (menu) and the down arrow on the front panel for 10 seconds or so. This toggles the power lock on and off for several Viewsonic monitors.
I hope this helps.
Cindy Wells
If you provide your model, I'll check my stack of manuals to see if Viewsonic changed the Lock procedure. Alternatively, seehttp://www.viewsonic.com and look for your model and the manual the site. Many Viewsonic models are listed.
Cindy Wells
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