@Armaghan786 , welcome to the Community.
The SATA power cable would be connected to your power supply unit (PSU) and it would be laying somewhere in the case. It would look something like the one in this link. Since the computer came with a M.2, SSD, a SATA cable may not have been provided.
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I am not an HP Employee!!
Intelligence is God given. Wisdom is the sum of our mistakes!!