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Drain it! You might be surprised that one day as you turn your computer on, it shows no display. It can be caused by electrical charges on the motherboard, I do not specifically know how it affects the display but in case this happens to you try to do a Power Drain. It's easy, first, take the battery out from the laptop and unplug the AC Adapter if it is connected(for desktops, unplug power cord from the CPU/tower) then press and hold the power button down for at least 30 seconds. plug power supply back into your system and turn it back on. There goes your display once again.
Remove the power cord.
Locate the 120V / 240 V ac selector switch. (within 4 inch from the power inlet)
Move it back and forth few time.
Make use it's set to the correct voltage selection.
Reconnect power cord and power up.
This AC selector switch can get shifted and set to different position.
I don't know if you have done anything lately,ie; updates to board, cahnge of cables, etc. but first, try shutting down system, unplug your cable for video, unplug tour tower, plug tower back in and restart. If this doesn't work. You may want to try a system restore back to when you had a picture. Try this and let me know if this worked by adding comment or reply at the end of solution. Dave
The system will turn off if you hold down the power button for 10 secs. Can you check if other monitors work fine with this system?? (my best guess is - NO) since this monitor works well with other systems, the monitor being a failure is ruled out. So this boils down to a system failure & not a failed monitor. Worst case scenario this one must be a Motherboard & Power supply issue.
Well as you have already tried disconnecting the peripherals from your computer, and tried restarting the computer too which did not help you, it sounds to be an hardware issue with the monitor. However if incase you have not tried this, you can disconnect the monitor completely from the tower, power on the monitor, if it powers on and you get a message as no signal, your monitor is working good. If not replace the monitor. If the message appears on the monitor screen, disconnect everything from the tower, push and hold the power button on the tower for a minute. Connect just the monitor and check for any display. If you do get display, thats good, connect one device at a time and check to see if the display appears.
If theres no display with just the monitor connected, the issue would be with the graphics card. You may need to replace it or get the system repaired.