Hello, Welcome to BleepingComputer.
I'm nasdaq and will be helping you.
If you can please print this topic it will make it easier for you to follow the instructions and complete all of the necessary steps in the order listed.
The 3 Beeps are most likely coming from the BIOS and is an indication that your have some Hardware problem.
Could be RAM or a failing Motherboard.
Check it out.http://www.computerhope.com/beep.htm
Bringing you computer to a qualified technician is probably your best option.