The continuous series of beeps should indicate that there is an issue with the power supply. If your PS is not 'large' enough, you can not support two HDD's, CD, DVD, etc. Disconnect one at a time...begin with the second HDD, if this is your situation. Have you added an after-market fan?
If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.
PC will not start