We are trying to put together a system using the Tyan K8SE motherboard and dual single core Opterons from the AMD/Microsoft road show. On powering up, the fans turn, the CD-ROM looks like it is being probed and the HDD access light is lit briefly and after about 5 seconds the system emits four separate beeps. After that nothing happens. No video - no anything. The four separate beeps is not listed in the book. The TYAN book does say that most common type of error is a memory error. Does anywone know what this POST code means? Thanks, Mike ..