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Sounds like a bad motherboard. It's getting power and turning on the fans and everything, except booting it up. Yeah, sure sounds like a bad MB. How old is the pc? You have to be careful with Emachines. They are built cheap and break often.
Well there is couple of culprit that cause this issue which ranges from a bad vga, motherboard, ram or even the cpu itself, First of all, check to see if you hear any beeps after turning the computer on. If you hear random beeps or constant beeps then it could be something wrong with your memories. The only way to test things out is if you have other hardware parts to test it otherise it is hard to pin point what is actually wrong. A simple thing that may help is by resetting the cmos, in this case you can take the side panel which would be on your left off by unscrewing the screws in the back of the case panel. There should be a nickel size battery on your mainboard. If you don't know how to short the pins, go ahead and just take out that battery for about 15sec or so and replaced back on. Then try to start your computer agian. If it works then good, if it doesn't then it could be other hardware component that become faulty. Like I said the only other way to know what is actually wrong is to have spare component parts to test it with.... other then that, you may need to take this to a computer repair place since the have the parts to diagnose it with.
3 beeps - check the manual for the motherboard that you have or your computer manual and it should tell you what the 3 beeps means.
If you need to find out what motherboard you have you should either be able to use wcpuid or SIW ( google them ) and you should get the correct utilities ( if not post back and I can post some links )
I would also suggest ( as long as its not under warranty still ) to take the side off of the computer and give the inside a clean out using compressed air.
Has it got anything new hard ware wise that was installed as this might be sapping too much power and stopping it from booting ?
different beeping patterns are codes which indicate what part of the hardware has failed (ram, video card, cpu, ect). the fan failure would not cause beeps, and would not cause the cpu to fail unless already in windows. if you could find out the manufacturer of your motherboard you could check with them about what the paticular pattern of beeps which you are getting mean.
Bad capacitor(s) on the motherboard can cause this problem, corrupted BIOS maybe... try flashing BIOS.
Probably the CPU if your not getting any error code beeps on startup.. NO Processor for the BIOS instructions thus no Beeps !