I have a Dell SP2309W monitor & right in the middle of working on the PC the screen goes black & a Dell alert box appears: "Warning entering power save mode", then the white light in the monitor power button turns orange, I know the OS is working because audio continues playing. Moving the mouse & key presses have no effect, pressing the power button turns it off & the same alert box appears when pressing it again, this is the same alert which appears when I power the PC down. The monitor is effectively stuck in power save mode & re-booting is the only way to bring it back.
This used to happen about 6 months ago & just started again, every few hours. I phoned Dell tech support & they said the monitor has no power save mode so the problem must be hardware, is this true or is it the monitor?
O.S: Windows 7 Ultimate
Graphics: ASUS GT22O HDMI
Motherboard: ASUS P5Q-EM
Audio: Realtek On-board
CPU: Intel Core 2 Quad Q8300 2.50GHz
RAM: Crucial 2GB