Was the entire monitor black or only within the windowed EQ? Most remote desktop apps i've used have a "Black monitor on connect" feature which blacks out your entire monitor, but still allows the person on the other end to see everything perfectly. If your entire screen went black, the IT guy probably could still see what was up on your desktop.
At the same time though, I too have had DirectX display issues with windowed EQ going black while trying to use certain remote desktop apps. So who knows.
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