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If you have a Sun keyboard, hold down the stop and d key while you apply power. This will force the system into extended POST which always outputs to ttya regardless of PROM settings. If you get output then you know the port is working. To reset the PROM variables, hold down stop and n. If you get no output with the stop-d then you may have a bad cpu, low bank of ram, boot prom, or MLB.
they will boot fine without a keyboard. At power on, when no keyboard is sensed, they automatically output to ttya. If you get no OK prompt, you are dealing with RAM, PROM, CPU, and MLB. If you have more than 1 bank of RAM, try swapping them. POST always loads in the low bank. Also try re-seating everything and blowing out the dust.