The site specs say Phoenix. The list does not show anything relative to the description of single beeps. Maybe count exactly how many beeps and when might help.
According to the manual though the bios code for long continual beeps say "no memory detected" but there is also noted codes that could be listed in the top left hand corner of the screen.
See the following manual:
Appendix B specifically, but motherboard listed errors start at Appendix A--
The only thing necessary for the triumph of evil is for good men to do nothing - Edmund Burke