My Nexus 6 won’t turn on again

Hi guys,

I’m new to this awesome forum! sorry for the bad start but i have an issue with my nexus 6, i tried to flash a stock rom with NExus Root Toolkit but when its done flashing my phone stop working suddenly. it doesn’t show anything!
when i plug it to my computer it shows a message like "Qualcomm HS-USB QDLoader 9008".

Please help me with this! i really need this phone back

Thank you.