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Thank you for reaching out to us Starlord71. The serial number is located on the back of the PC towards the top and is the one above the bar code. The ET number should be the correct serial number. If you have any further questions or concerns then please do not hesitate to give our tech support agents a call for any assistance; we're always happy to help. Tech support: (888)937-5582 -CyberpowerPC Support
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