One error message I hate to see when troubleshooting is a “No Signal” on the monitor as there are numerous events that could have cause this to happen and each one has to be checked on-by-one to find the root cause.

Video Cable
The cable is usually the first thing to check as it may have become loose behind the computer or the monitor. Unfortunately, some computers are in a protected podium (to prevent theft) so you will need to make sure that you can get access to the key for the lock along with having a flashlight to see in the cramped, dark space.

If the cable is connected at both ends firmly, please release them from the monitor and computer and check to see if any of the pins are bent or broken off. If tweezers can not repair the bent pins or it is broken off, you will have to replace the cable. Be sure to check to see if it broke off in the monitor or video card port.

Graphics/Video Card
The integrated video card on the motherboard can go bad over time and a quick way to tell is to try known working monitor and cable. When those fails to work, try to add an aftermarket video card to the computer. If the aftermarket video card works and your computer is under warranty, quickly get the manufacture to replace the motherboard but be warned, the motherboard will most likely be refurbished. If you are out of warranty and the repairs are more then the video card, leave it in.

Video Port
Does the computer have multiple (internal and aftermarket) graphics/video cards? If so you have to tell the computer which graphics card you are planning to use in the BIOS and make sure the video cable is connected there. Some computers forces you to utilize the aftermarket card so remove the card if it will become an issue.

Power Supply
Can you hear the power supply powering on the computer? If the computer is not on, the motherboard will not be telling the graphics/video card to send a signal to the monitor and hence the error message on the screen so be sure the monitor is connected and power on the computer.

OS Settings
Computers has the ability to go to sleep after a set period of time along with the monitor as well so be sure that your power settings are disabled to prevent sleep or set to to a period of 4 hours or more to get you through the day.

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Stephan Pringle

Chief Executive Officer at Sipylus

About The Author: Stephan Pringle is an Information Technology Specialist. He covers hardware and software and provides tips for you to troubleshoot and repair issues on your own. In his spare time, he writes articles about the State of New York on his Hackintosh and HackBook and that has helped him to become the top contributor of the New York City section of Yahoo! Answers.

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