computer with USB keyboard hangs in loader boot prompt after a time

[Sergey Matveychuk]

Hi.

I have a machine with Intel DX58SO X58 mother board (no ps/2 ports). 
I've installed FreeBSD 7.1 on it without any problem and it works fine. 
Till I need boot from another device. I press 6 in boot menu, get loader 
prompt and the computer hangs after a time. Quite random time. From 
second to tens seconds. I thought it just keyboard froze, but once the 
computer started beeping, so it looks like a memory corruption or 
something like that.

-- 
Dixi.
Sem.