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Monitor was in standby mode, computer was on. Now it shows no signal and when we try using the menu button (2) it flashes white, black, red, green, blue then a teal color.

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The monitor is not receiving a signal from the computer which is why the multi coloured bars are showing. Ensure the lead is connected and is connected to the correct port of your computer. If it is connected correctly then either your graphics card is faulty or the lead, or monitor is

Posted on Apr 03, 2011

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1) "The monitor is not receiving a signal from the computer"
You know your monitor is good. The test color patterns also indicate this.

The next thing to check would be the monitor cable, IF detachable. Use a Known to be good monitor cable for a test.

If not then another Known to be working monitor, and cable would then be used for a test unit.

After the above diagnoses is taken then it's time to check the graphics card, (Video card. Same/same), IF there is a separate graphics card.

If not the computer uses Integrated Graphics.
The graphics is OnBoard.
(Graphics chip soldered directly to the motherboard)
A graphics card would then be used to diagnose.

However at this point I would like to point out, that most computer failure can be attributed to a bad Power Supply, and/or the computer is dirty inside.

LED lights may light, and fans may spin, but the Processor isn't receiving enough power to turn on.
Bad Power Supply.Weak voltage power rail.
No Processor operating, No video signal from the computer.

1) If ALL of the LED lights were on at once they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use 51 to 125 Watts of power.

This is why even though LED lights may light, and fans may spin making it appear the computer is working, in reality it isn't.

Do you have another Known to be good, Compatible power supply for a test unit?
Perhaps one in a computer that is no longer used.

For questions regarding any of the above, please post in a Comment.
Regards,
joecoolvette

Posted on Apr 04, 2011

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