Viewsonic 20 inch monitor - no display

[darkydark]

hi
i have a viewsonic 20g monitor
It is givin a wierd problem.
The monitor randomly works or stops working. Say i Am using it throughout the day and switch it off at night - the next morning when i switch it on it may or may not work. By not workin i mean that the power switches on but there is no display. if someone could help it would be great. thanks