Item under warranty but the seller doesn't respond

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Good evening everyone,

I bought a laptop almost 2 years ago that, out of nowhere, stopped turning on 2 days ago and no longer shows any signs of life (I’ve already tried charging it and resetting it as explained on Apple’s website, but nothing), so I went to check the invoice and realized that for another 7 days the product is still covered by the 2-year legal warranty, so I immediately got in touch to contact the seller. (seller with around 100,000 sales and 99+% reliability)

The problem is that the seller hasn’t replied to me for 48 hours (I sent a message through eBay and also an email to the address listed in the seller details), but when I tried asking a question about an item for sale with another eBay account, he replied in less than half an hour.

Any advice? I’ve already contacted eBay customer service but they basically made it clear that if he doesn’t reply, it’s my problem