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Hi there, sorry to hear you're having trouble with the viewsonic,
can you clarify something for me, when you say it goes off, does it power down entirely, or does it seem like just the screen is turning off?
If you try to turn it on, and look very closely at the screen (hold a flashlight up to it), do you see any images, even though it may not be lit up?
In either case this would indicate an internal hardware defect. Most likely it's the power supply going out (aging parts, capacitors cracking or drying out), which would explain it not powering on properly, or at all. If you can see an image, but no lighting, then the inverter that powers the backlight has most likely gone out.
Either of these would require repairs to correct, and for a monitor of this size and age (circa 2008), they just aren't practical to fix. Even a new monitor isn't worth fixing once the typical 90 day or 1 year warranty is up. It is almost always cheaper to buy a new one, as you'd spend several hundred dollars in parts and labor for repairs.
For example, you could upgrade to a 24" monitor, with LED technology, for under $200
ASUS VK248H-CSM 24-Inch Full-HD LED-... (click for link)You could also get monitor comparable to your current viewsonic (22inch, but also upgraded to LED, though minus the webcam) for about $160:
ViewSonic VA2212M-LED 22-Inch LED-Li... (click for link)
If you'd wish to pursue repairs of your viewsonic, which I would caution against for practical financial reasons, I can try to help you find a local shop.
If you think you're up to repairing it yourself, I can try to help you find parts, but from a brief search I've done already, this model is so long discontinued that ViewSonic has stopped making parts, and you'd likely only be able to find used ones, if you got lucky, on ebay.