I had a similar problem with a Dell monitor after a power outage. I pulled the monitor apart and found a connector not completely seated. I think that something internal has happened to your monitor. It could be an internal fuse or something. If you don'r feel comfortable taking it apart, find a reputable service center.
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I had a similar problem with a Dell monitor after a power outage. I pulled the monitor apart and found a connector not completely seated. I think that something internal has happened to your monitor. It could be an internal fuse or something. If you don'r feel comfortable taking it apart, find a reputable service center.