Type 7 keyboard problem?

["Alexander Vlasov" <alexander.vlasov@gmail.com>]

Hello,

I'm trying to install Etch on Ultra 45 workstation, and I'm stuck on the very beginning.
I'm able to press stop-A, and `boot cdrom'; SILO appears and I can type in "expert" or just press enter -- but when installer itself is loaded, by keyboard doesn't work at all. No led on Caps lock, no stop-A, nothing.
Keyboard is Type 7 USB.

How can I solve this? 

Thanks,

PS. Please CC me, I'm not on the list