DEC/Compaq XP1000 can't see keyboard - ideas?

I've recently received a Digital/Compaq XP1000 - 667MHz 21264 Alpha CPU, a mid-tower system nigh-identical to the Professional Workstation series (PWS 433/500/600). It came with 1G RAM and a PowerStorm 4D/20 PCI video card. I can access the SRM console through one of the serial ports, SRM version is V5.9-1. Unfortunately the machine refuses to recognize any keyboard I've tried. I've used the DEC LK411 off a working VT510, a spare LK411, an SGI PS/2 keyboard, and an IBM PS/2 Trackpoint keyboard. In all cases I get a message during POST that reads "No keyboard plugged in" before the "E8 ... E4" countdown. I've double-checked that I didn't have the mouse/keyboard ports backwards at various points. :) Just now I powered it up with the Trackpoint and I see all three status LEDs on the keyboard flash, then nothing. I get the "no keyboard" message and SRM prompt on the serial port. No output from the PowerStorm, and if I hit the CapsLock on the keyboard the LED does not light. A SHOW DEV on the console gives an appropriate-looking entry for a "vga0" device. A SHOW CONFIG gives a lot more output, including a "PowerStorm" device in slot 9 of hose 1, bus 2. However I have never gotten any output on the video card. I have not yet tried it in a PC. Any suggestions for what to try next? I'd like to have the option of running DECwindows... Thanks, /--/Steve.