When i turn the power on, 3 beeps play, the fan runs and the power light comes on, but nothing else

Do any lights come on at the case? eg at the front or on the port where the network cable is plugged in.
Does the psu fan spin when turned on?
If you can open the case, there is usually a green(?) led on the motherboard that lights up when powered on.
If nothing is happening, it could be your power supply. Try swapping it with a spare one (check that it is a standard pin layout.
Look at ebay, local pc store etc for a cheap atx psu tester to see it the power supply is ok. Or google how to jump start a pc power supply with a paperclip and/or test with a cheap multimeter - usually with the green and black wire from memory. (careful playing with electricity though and read up on how to not short out your computer and damage something else).
Otherwise, the motherboard itself may be dead.

if turning it on with no RAM installed doesn't make it beep to indicate no RAM, it's sounding like it is the motherboard that is damaged.

If the computer is still under warranty, I'd suggest taking advantage of that warranty to have the motherboard replaced. If not, you are better off just buying a new computer.

have you tried holding the power button on power up until you hear the second beep ? it resets the video it might help u? dunno try it :)

Hello

Have you tried swapping out ram modules? This would probably be the cheapest. And, a faulty ram module gives a beep code. Try it, and let me know.

Kind regards
Andrea

Disconnect everything from the motherboard except the power supply, CPU and power switch.

Turn on the computer. You should hear 3 beeps because you removed the memory.

If you don't hear any beeps, check the power supply. Check all the connections. Did you connect the 4 pin power? Did you skimp on it? A common mistake is to get a cheap, high-power supply. Just because the box says it's 1000 WATTs doesn't mean that will carry a steady load.

Still nothing...

It's either a bad motherboard or processor. If you have another processor that is supported on that board and you know it works, try it. If it boots return your CPU for a good one.

Unfortunatly, if it doesn't boot with a known-good processor that just proves the board is bad; it doesn't prove your CPU is good. You may have more issues.

Read this very carefully. Turn off your ps3 from the back. Then turn it back on wait unit the light is red. Turn on the system through the front keep holding the power on. You will hear a beep one time that just tell you that the ps3 is powering on keep holding the button until you hear the second beep this will rest your video setting. If that dosnt work call me at sony

Check the beeps code at this page:
http://www.computerhope.com/beep.htm

When a power supply goes out the way yours did, it's going to fry the MB 99% of the time. So you're going to need a new MB. It's possible that you CPU is ok, but that could also go too. I would replace the MB first, then the CPU if that doesn't work.

try a cheep video card from your local used computer parts store they're every where, you'll ask for a pci video card.