I have a Optiplex 260 stuck in standby mode. Have tried three montitors with same result. All monitors test fine when detached from the box.
I have shut it down multiple times, unplugged/replugged all connections several times, etc.
I was replacing and old monitor with a new Dell 17 inch flat panel when this error occurred, but now it seems stuck on the previous monitor as well.
The flat panel shows analog input is fine, and that power saving mode is on and that touching the keyboard or mouse will unfreeze--but of course it does nothing but stay in standby.