Between the beep and the keyboard LEDs staying on I would guess that you have some thing stopping the POST.
Look in you user's manual to see what the beep indicates.
dcc
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If the keyboard is connected via USB it will need to be enabled in the BIOS. Do you have an old PS2 keyboard that you can use to access the BIOS?
dcc
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To change out the PSU is simple, you might want to take note of the connectors for fan/s on the motherboard. The rest is pretty simple, every where a wire comes of the mother board and attaches to a peripheral device gets connected to the PSU.
dcc
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Emachines have a stigma associated with their PSU failing and taking the motherboard with it. It does sound like the motherboard has gone south.
Investing more money in a three year old machine is not a good investment. I agree with fixer, I would cut my loses and either build a new computer or purchase another.
If your new PSU has the 24 pin motherboard connector and the square 4 pin connector you will be able to use it with the newer motherboards. As suggested you could reuse your peripheral devices and replace them with newer SATA drives later. Of course you will already have the mouse, keyboard, and monitor.
The hard drive could be a problem, in order to use it in your new build you would need to wipe the hdd and then install it, format it, partition it, and reinstall the operating system...if you have the OS installation disc and product code. If you don't then you will need to purchase one. The reason that you need to wipe the drive is because the hdd is used to seeing the chip set of the old motherboard, and when you install it with a new motherboard with a different chip set it can confuse the hdd enough that it may not recover. This would also apply if you were to replace the motherboard in you emachine with a different different chip set. If you have access to another computer you could connect it as a slave drive and copy the files you want to save to either CDs or DVDs. If you purchase a new computer you can also transfer the files from one hdd to the other directly.
The benefits of building you own machine is that you can build it for your specific application, you will have better components than what most manufactured computers use, and of course the pride of having built your own.
The benefits of purchasing another computer is that you will not have to learn much more and can rely on a warranty, and won't have to wait.
dcc
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Did you look in the user's manual to see what the beep codes are?
dcc
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