Viewsonic VX2025 problem. Letters get blurry near the edges

For those of you who recall, I posted an earlier problem about analog signal interference and now that's gone. We basically cleaned the PC with a vaccum cleaner and oddly enough the "shadowing" disappeared. But, before that we sent if for repair AGAIN, they said they made some changes to see if the "shawdowing" problem goes away. Well it didn't hence why we took a long shot by opening up the PC and cleaning it. But now I've come to find that letters/icons near the left hand side of the screen become "thicker" and bolder (i.e it looks as if the font has been made darker). It's very noticeable when I'm reading an article and half way through the letters just change thickness and boldness. Does anyone have any idea on what I should do? Thanks in advance for help.