SOURCE: Screen is out
A black screen, actually purple, means that a firmware upgrade was unsuccessful. You can try to fix it by reloading the firmware, but you are most likely not going to be successful using the USB 'binary'firmware that is available.
There is some 'text' HEX firmware available on the yahoo Explorist user group. To use it though, with your USB cable, you will need to make a small circuit with 1 chip. That site shows how to do it. I am in the process of doing that for an Explorist 400 for a friend. Others have said this is the only to recover such a lost GPS. I'll keep you informed of my success when it happens. I'll probably be sending the circuit/cable I build along to other friends but could possibly fix your for you if you like.
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