In work, I have a few old Sun workstations. Some of them have poor HDD.
Sometimes they fail to boot up. Usually the booting stage won't be able to finish, so the screen stops at the middle of booting.
To fix this,
If you have a Sun keyboard, you can press 'Stop' + 'A'.
Then 'ok?' prompt will come up.
Type 'boot -s', so you can boot the system as single user.
Login as root and type 'fsck -y' to check and correct error on the HDD.
If this cannot fix the problem, probably you need to replace the hard drive.
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