|Whatever is making the beeping you can be sure it is not the hard disk. There is nothing in a hard disk that will make a beeping noise, grinding noises, whining or clicking noises, but not beeping.|
You will find the beeping is coming from the system speaker or the pitzo-quartz device that is used for this purpose. It is often situated low down in the case close to where the hard disk is located.
The beeping is generated by the BIOS indicating there is a fault condition on the hard disk. The number and length of the beeps will give you an indication of what the fault is. The motherboard manufactures web site will tell you what the beeps mean.
Either way, I think your hard disk has died and you may need some data recovery software.