My mac keeps switching its self on and off from apple sign

i rebooted it to factory setting cos my daughter forgot her passwords

Answer this question I have this problem too

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2 Comments:

Can you give us the last four digits for your daughters system so we can correctly identify the system.

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Do you have access to a second Mac system and do you have a USB thumb drive (or external HD) which you can reformat (16GB or larger)?

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