My monitor just started this a few days ago where I'll be surfing or playing a game and suddenly my monitor shuts off on it's with a "no dvi" message appearing briefly before going dark yet my hard drive is still running(if I was playing a game I can hear it continuing sometimes till I die in game lol. Just had my computer checked as I initially thought it was a power issue but it came back with a clean bill of health. So I'm left to wonder if it's the dvi cable? Or the monitor itself or something else.

Re-seat cables