Ultra 5 won't boot after Solaris 8 install

Hello. After installing Solaris 8 on an ultra 5, the system won't reboot. After trying many permutations of the install, including a bare minimum and the whole shebang, it became clear that the system always hung at the same spot in the boot process (from a boot -v), immediately following the line:
cpu0: SUNW, UltraSPARC IIi (upaid 0 impl 0x12 ver 0x13 clock 270 MHz)
Has anyone seen this problem before? We reset the boot PROM with set-defaults from the ok prompt and that made no difference. This machine ran fine under Solaris 7, so I don't think it's a hardware failure. Any suggestions would be greatly appreciated. Thanks!
--jenny

Can't be the OS if the disk doesn't show any activity.
I can't tell from your post if you're using a screen/keyboard or a serial console? Have you removed the keyboard and attached a serial terminal to serial port A? Several types of hardware failure will output errors there even if the failure occurs before the framebuffer is initialized (memory errors are common).
Darren

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****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
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