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There are 2 basic reasons for the "No Signal" message.
Loose video card inside the machine- if you're machine didn't come with on board video or if you are using an independent video card instead of on board video, the card can unseat at times, either due to movement of the machine or pulling on the video cord
Loose connection between the video cord and/or monitor and/or machine. Unless the plugs on both ends are secure (including tightening both screws to prevent loss of connection), the cord can dislodge just enough to interrupt your connection, causing a "No Signal".
If neither of these is the case, try hooking up a different monitor (if equipped, you can use an HDMI cable to your TV) to see if the "No Signal" message persists.If using a different monitor works, the issue is your Acer Monitor.
make sure all the plugs are plugged in snuggly turn off the computer again then turn on the screen. next power on the computer. if that does not solve the problem you may have an issue with the video card.
try takeing the ram cards and clock battery out and unplug the tower from the wall wait 1-5 min then plug everything back in this has worked for me several times on several different computers not sure it will help you but its worth a try
Mine did that too, I have sent it to Acer for Warranty Acerization, it came back in a week booting fine. Worked for 3 months and then quit again. These boards are used y other cheapos like Gateway and Packard Bell. Solution - trow away the motherboard, keep the CPU and RAM.