I can't remember the beep codes off the top of my head, but i know more then 1 is bad, and i think 3 is ram. If its possible to count them do it and look up the codes, if its in rapid succession to the point where you don't know how many beeps are then I'm not really sure. If you get past post however it seems more likely a harddrive error or something. Could be your hdd crashed or possibly some other device is causing the issue, if you can remove all unnecessary components and boot (unplug your cd/dvd player and any extra pci cards that aren't needed) if you have a spare hdd you could try using that to boot with or doing a clean install if you don't need any of the data on it. I would also double check your graphics card/ram are inserted correctly and that your harddrive is appearing correctly in the bios, while your in there also take a peak at the cpu temp see if its abnormally high at all.
I'm not really a hardware expert (In fact I'm a programmer) but hopefully someone with a little more debugging skill then me see's your post and can tell you anything I've missed.