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If you've already reset it and there's no SD card in there it does sound a bit fooked.
I've recovered an 800 by copying back onto it a stock drive image but if you can't even get the thing to mount in a computer...Oh, try another PC. I had issues with Garmin on my old PC as well, just thinking about it.
Have you plugged it in with Garmin Express to see if there's firmware update or something that can be done?