Why is my monitor displaying an “Attention! No Signal” message?

Srinivas N September 19, 2012
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When I power on my computer the monitor indicator which should be green while in operation switches from green to amber, showing the “Attention! No signal” message. I have ensured that the display cable and power cables are tight enough. Also I checked the cable with another computer and the cable is working fine…

Can anyone shed some light on what exactly in the computer is causing the problem? I have gone through some links but would like some more insight into the problem. Thank you in advance!

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