Long beeps like this usually signal that theres a memory problem. Check the memory FSB is not too high, the modules are correctly seated in their slot and that they are definatly working. Most beep codes are generic across all brands of motherboard and bios and this signifies a memory problem. If it's not the memory, I reckon it's a duff mobo.
Oh, have a bit of patience too.
Delta: "What's wrong Chris?? Chris: "I miss my old Cyrix"