Hello:
I did find a matching beep pattern on the beep page.
I do not know the BIOS (can not read it on any board chip). It is either AIM, Phoenix or Award. I did find a small square chip with "PH" on the top line.
When I push the on button, an endless beep is made at the same rapid interval. I counted 25 before I stopped. I tried two more times with the same beep pattern.
When I push the on button, the power supply starts and power lights on the front of the panel display. Nothing displays on the monitor.