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You should be more specific next time - is it a laptop or a desktop computer, do you have additional graphics card, etc? I've already googled for a PC type. You have a desktop PC which comes with integrated graphics. It has two video ports onboard - VGA and HDMI. Which one did you try? It could also be that you have additional graphics card installed. In this case integrated graphics card is turned off automatically. Sometimes people accidentally connect their display to the wrong port - you should check that. It could also be, that you don't see any video output, because of faulty hardware like RAM, CPU or the Motherboard. Do you hear any beeps or other sounds during startup?
Please check the cable that connects the monitor to the video card. Reseat the cable, the issue might be a loose connection. You can also try a known good monitor to isolate if it's the video card or monitor that is causing the problem. Something is preventing the monitor from receiving signals from the video card, hence the "no signal" message.
the screen is blank? when it is like this and you pree number lock or caps lock, will it turn those lights on and off on the keyboard? If so, I would just check the monitor connection, those connections can get loose, get dust in them, or ever have the connectors wear out after a long life.
But it could be just a Driver or Software issue. I would update the Audio Driver... go to: http://www.emachines.com/support/drivers.html and locate your PC Model the Download the Audio Driver. It shows 2... use the first one. If that fails try the second one... the second one will write over the first...
If both fail... then if you want to do it youself... head to a PC store. If you are mechanically inclined and can read directions... I would try it youself. You will need a PCI Audio Card... Install it at the very bottom or last Slot in the System. Of course Power unplugged and again follow the instructions.