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Remove the Power Cord, Open the Case and remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.
I'm going to guess pwr supply 12 volts side. The 5 volts side lights up keyboard and mouse; both get replaced when they fix (replace) the power supply.
The hard drive and dvd player us the 12volts side.
Check 12 volt supply side if low disconnect hard drive check voltage again,, if 12 volts hard drive bad,,, if low disconnect dvd,,, if 12volts connect hard drive,,,if 12 volts dvd bad. of course this scenerio can go the opposite way. Do you know how to use a multimeter? Black box maintence is exciting.
update your driver software for the cd/dvd drive that you have just go to the emachine support website lookup your computer and download the drivers for the drives if that doesnt work it might be a loose connection in the case open the case and make sure all the connections in the case are connected tight and right to the cd/dvd drive
check if you see the dvd drive when the computer starts, right after you hit the power buttom start pressing Tab key and make sure you see the dvd drive there if you do, turn off the computer and turn it back on and hit F8 on your keyboard and go to safe mode, go into accesories,system tools and click sytem recovery pick a date and hit finish after that just boot normaly and try it.