My e machine monitor says no signal detected when the computer is on? what could be the problem and how do I troubleshoot it?

may not be getting signal from computer. check computer connection to monitor.
May have cable in wrong port on computer.
Some monitors go into a power saving mode when no signal is detected.

Check ALL cables, connections, try another monitor/cable. You didn't provide the Model of eMachine? Does it have a PCI Graphics Card? Reseat Card.

When the monitor says no signal, it means that it is not detecting a monitor. You need to check the cabling of your monitor and verify that it is properly plugged in. Normally its a blue VGA connection or a white DVI connection that goes to the back of the computer. Also, some monitor requires a seperate power source and you need to check this as well

Where the cable is plugged in, a terminal probably came loose internally. DO NOT ATTEMPT TO REPAIR THIS YOURSELF! There are very high voltages inside. Buy a new monitor or take it to a repair shop.

That "red white green and blue" block is a color pattern tester. that means the monitor is on, but is not receiving a signal, so its running tests. If your monitor has Digital input and VGA input, you may just need to switch inputs. Look for 1 or VGA if youre using the blue hook up. look for 2 or digital or dvi if youre using the larger white hook up. Some monitors also have 'auto detect'. If you are in "auto detect' bbut the color box is still there, then your monitor is not receiving video signal from the computer. It could indicate a bad cable or no signal being sent by the machine. If you try another monitor, you can see if the machine is working. I would try a monitor setting for VGA-1 first, since thats most common.

Try it on another PC, check the pins at both ends of the VGA cable or try new cable. Try another monitor with this PC. We need to isolate the problem first.

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try a new cable - if the issue isnt the cable then u may have a bad monitor

Check all of your cables - VGA / DVI mainly in the back of the monitor and the back of the PC.

you could need to update your driver.if you need help doing it get back to me.

IT MUST BE A DPI.IF UPPER THAN 60Hz THE PROBLEM WILL BE OCCUR AGAIN.I THINK