Nexus 6 won't turn on topic

So I have an opportunity to trade my droid turbo for a nexus 6, which is what I've been trying to do for a min. I found one that is in perfect condition, but it will not turn on. The seller says that the green light will blink a few times when he plugs in the charger, and then it stops and that's it. He said the battery died and couldnt get it to turn back on after that. Phone is just over a month old and he hasn't done any troubleshooting. He already ordered a replacement and isn't worried about trying to fix it. Has anyone else had this problem or know of a fix? I'd really like to make the trade but don't wanna be stuck with a broken phone. Thanks for any input!

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