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HP VH420a Monitor

I have two hp VH240a monitors. They are both hooked up to my ThinkPad laptop. I had to disconnect the HDMI and power cords when I took a proctored exam. When i plugged it back in, the computer would not recognize it as an hp VH420a. It keeps reverting it to a generic 640x480 driver, and will not recognize the hp VH240a driver when I install it. I'm at my wit's end!!

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