The likeliest problem here may be a burned out or failed projector bulb. Most projectors will fail to power up at all when if the bulb is out. The HD20 user manual does not specify a red light as an error indication option however, generally amber.
User manual .pdf is located
here (takes a bit to download for it's size), Projector Status Indicator instructions are located on page 40.
Here on the
product page itself, an email to Optima support may be warranted given the red instead of amber error light.
If you had any messages recently indicating your bulb life was nearing it's end, again, this would be my first guess. Certain models of projectors do have a tendency of blowing through bulbs even before any warning message comes up. I had an experience with a certain brand/model that for the last 3 replacements has given only about 1/4 of the stated bulb life, so unfortunately it does happen.
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