So, I stupidly flashed RenderBroken's Custom Kernel for CM11/AoCP/OmniRom & SlimKat on my Nexus 5 running latest CM11 without checking its meant for AT&T Samsung Galaxy S II SGH-I777.
After hitting reboot upon successful flashing Nexus5 went off and doesnt boot at all.
Doesnt get into fastboot or even download mode!
When connect charger, nothing happens and on connecting to PC only shows on device manager as unknown device!
Any way to fix? Or need to take it for repairs?
But i could atleast see the google logo in the beginning so i was able to get into fastboot mode and flash another kernel.
So if its completly dead/blank then you need service, if you still have an ok bootloader and sees the google logo you should be able to get into fastboot mode.
hold both volume buttons pressed, and then try to start it up by holding the power button.
( i had to hold the power button for 10+sec for it to start/turn off)