Cancellation on electrical appliances MediaMarkt from When does the first cancellation day run?

I ordered a laptop. But it seems to have problems with temperature and volume. I wanted to test it until after Christmas because you have the right to give it back for 2 weeks. I ordered it on the 13th (Sunday) and received it today (16.12.). Then wanted him on December 27th. Send back if I can't find a solution to my problem.
But from which day does the first cancellation day apply? On the day of receiving the goods, or on the day of the order?

Electrical devices generally have a warranty period of at least 2 years in the event of defects.

I doubt it's a defect. I've read that these types of laptops that I have ordered are generally noisy. But I didn't think it would be so loud. It's like a washing machine * laughs * It's all about the cancellation within 2 weeks