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I did something similar a while back on an old Acer monitor, except I used 3mm white LEDs and hot glued them in a strip, I used a FET to control the LEDs using the front panel power LED as the on indication. It worked except I spaced the LEDs too far apart, the white LED strips weren't as available when I did it, and those were very expensive. I definitely recommend using the strips for the best results. Many thanks for posting this.