I have a galaxy player 5.0 -old build and everything, but I like to experiment with it- and i wiped cache and did a factory reset and tried to reboot, and for some reason wouldn't want to boot up. So i just killed it, and tried to re-flash the stock firmware(had been rooted and some other stuff), and it failed, and now it just has a pic of [phone--triangle with !-- computer]. I can't get it to go anywhere- recovery mode, downloading mode, can't even turn it off without taking the battery out. My question is, am i done for? Is it hardbricked?
It's probably not hardbricked, only softbricked. The phone with triangle and exclamation mark is telling that you didn't flash properly. In that case it should still allow you to boot into download mode. Remove battery, put it back in and hold the appropriate buttons to boot into download mode and then reflash rom