Ultra 60 won't boot

I just was given an Ultra 60 that I'm trying to get started so that I can re-load the system with Solaris 10. I can't seem to get the system to boot past the initial memory check. I've tried to do an Stop-A to get to the eeprom, but can't do that. My next step is to try to send a break from the serial port.

Here is what I get when I boot:

Sun Ultra 60 UPA/PCI (UltraSPARC-II 360 MHZ), Keyboard Present
OpenBoot 3.23, 256 MB memory installed, Serial #10577431.
Ethernet address 8:0:20:a1:66:17, Host ID: 80a16617

Then it does the little whirly thing counting the memory and I get a block cursor.

thats it....can anyone help me...

thanks