iPhone 6 wonts get past the apple logo

I got a iPhone 6 four months ago and it stoped working three days ago. When ever I press the sleep/wake button or the home button all it does it light up to the apple logo then turns right back off. About two months ago I accidentally chucked it into a bucket of 6inches of water. I powered it off and put it in rice for 72 hours before turning it back on. I don’t know if this has anything to do with it. When I leave it pluged charging it likes to have random panic attacks and flash to a bright white screen then turn off a second later. All of the comments I have seen have said to restore it and plug it into iTunes but my computer won’t even recognize that there is something plugged into it. I took it into the apple store today and they said there was nothing to do but the internet was invented so might as well ask around before tossing the peice of crap in the electronic recycling. Please Internet, you’re my only hope…