Well LG stands for Lotta Garbage!
Try checking the monitor to PC cable, if it's not fully on it will cuse color spread like you describe. One of the pins may not be inserted into the cable properly.
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Sounds like a faulty digital board if its still under warrenty send it in to dealer if not unless u can find one with a cracked screen on ebay and get it cheap fix ures then sell it before it has the same problem
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