If the on screen don't work, it's bad. Real bad.
http://www.google.com/search?hl=en&client=sandm&q=940BW+FACTORY+RESET
I have a Samsung 19 inch led flat panel monitor. Model 940BW, Model Code: LS19HAWKBY/XAA, SN # HA19HTAP110095B. When I start up my PC, the monitor will flash what is on the screen and then go blank (black). If I shut the monitor off and turn it back on it'll flash again and go blank. I know it's the monitor with the problem because I hooked it up to another computer and it does the same thing. I've checked the connections on the cord and everything seems tight. I even reversed the cord (unplugged it from the monitor and plugged it into the PC). Can you tell me if this can be fixed or should I trash it? It's only a couple years old. I thought it would last longer than this.

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