Question [Q] Can't recognize USB in Fastboot

dear all, my first post here @xda
i am using ignorance v4 on my htc one v and i trying to move to shpongle.i did everything.i flash the kernel before flashing the ram but after the rom flash, when i go to fastboot mood, my laptop says cannot recognize the device by saying maybe the device is not working properly try reconect the device. I have all drivers installed and before this i used many roms but never faced this problem.android sdk installed.al in one toolkit and every other option.when i go to the adb or fastboot whatever you say, the laptop stop recognizing my device.it works when my phone is in normal mode and i can transfer files or anything.htc sync manager is also there.I can reinstall the ignorance from my sd card and it works normally.but shpongle stucks on boot screen, which mean i need to flash the kernel.but how can i flash the kernel file.it stop recognizing usb connection when i try to connect fastboot usb.
i change ports,laptop, cable but nothing works.
plz plz help me on this,i cant go back to stock rom in this situation