Default [Q] Permanent black screen

Hey guys,

I failed at the first step :S

Tried rooting my phone, Switched it off, turned it on while holding vol + and -

The screen is now permanently black. I didn't even get to fastboot :S

I've tried different combinations of the power, +, - buttons as well as plugging in the usb in and out and nothing seems to work.

when i plug in the usb, The PC makes the sound which suggests the drivers failed to install, and under device manage i've got a yellow triangle that says QHSUSB_BULK

Please help guys. My Nexus is 2 days old :'(

EDIT: nevermind, pressed Vol down and power while usb plugged in and it loaded into fastboot.