# You probably don't have enough power from your USB port… or,
# you can not boot that age Mac from USB (Firewire or optical disk only).
The first could be solved , ''possibly'' by putting '''a self-powered USB hub''' inline between the computer and the "universal" adapter. or by getting a firewire ported external case for the ATA drive.
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'''You should be able to access the data from the drive''''' (but not boot from it)'' using your adapter to connect to a much news model Mac.
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''If this Answer is helpful '''please remember to return and mark it '''Accepted.''
'''Two possible reasons: '''
# You probably don't have enough power from your USB port… or,
# you can not boot that age Mac from USB (Firewire or optical disk only).
The first could be solved , ''possibly'' by putting '''a self-powered USB hub''' inline between the computer and the "universal" adapter. or by getting a firewire ported external case for the ATA drive.
''If this Answer is helpful '''please remember to return and mark it '''Accepted.''