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Any ideas why this happens and how to fix it?
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Press the "On" button on your monitor?
Have you tried just waiting a few moments for X to restart and the monitor to wake up?
It's a bad idea to power down your linux box by pressing the power button. Not all systems will shut down gracefully if you do this.
We need more details: Monitor model, make and how it is connected to your PC [what sort of cable - VGA, whatever, for a start. Links to the manufacturer's (PDF?) manual would also help us help you. What is your graphics card? What modules are you using to drive it?