Two *Beeps* indicate a memory issue, first try opening the case and remove and reinstall all the memory modules and see if this makes a difference, more troubleshooting procedures can be found in the Vostro 200 Mini Tower Troubleshooter HERE. <ADMIN NOTE: Broken link has been removed from this post by Dell>
Helped me resolve my problem. Someone had taken one of the memory modules out. Replaced the module and now everything's fine. Thanks for the help.
I had same issue. Removed DIMMs cleaned contacts and re-seated them. It's back to work once again.