Computer monitor no signal

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Thursday July 16, 2015
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Wednesday October 8, 2008
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Last night my computer froze, so I held the ON button to shut it dowm.
This morning when I turned it on, it was fine. Then suddenly the screen just went black, and the monitor says no signal.

I switched to another monitor and cable (which works for my other computer), and it still says no signal.

The computers seems fine, the fans are turning, no beeping noises.
I tried unplugging the power chord and hold down the ON button for a minute.
I tried taking out the RAM, the CMOS battery, cleaned them and put them back in.
I spend the whole afternoon cleaning the hardwares.
Nothing works...

Does anyone have any suggestions?

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Wednesday October 8, 2008
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If the monitor is not receiving a video signal it displays that message.

Common causes are a defective video card or motherboard.

Good Luck