Fastboot freezes when USB plugged in - Nexus 7 Q&A, Help & Troubleshooting

I am able to get into bootloader. however, the problem is that whenever the USB cable is plugged in, the buttons don't navigate through the options. whenever the USB cable is NOT plugged in (and reboot bootloader) the button work just fine.
I don't have a recovery currently installed.
the issue is not with drivers on the computer or the usb cable...
happens while USB plugged in windows, linux or simply just plugged into a wall outlet to charge.
I need to get into fastboot but i'm having this issue with the bootloader (corrupted?).
any help would be appreciated.
bootloader version 3.34
nexus 7 (grouper)

It should work with the original cable, but other cables may or may not work. If you are using the original, try a different usb cable. Also, try other usb ports or another computer.

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[Q] No usb after 5.0.2

Hi i have a nexus 7 (2012) everything was working fine until android 5. The device was slow and almost unusable. Then the 5.0.2 update came out and guess what? I updated it and now my laptop wont recognize the device so i tried a different cable and nothing. I plugged the nexus 7 in my second computer and nothing not even the sound that means you plugged something in the usb port. So i went to my brothers house and tried his computer.... the same... nothing. We plugged his nexus 7 (2012) 5.0.2 wich is the exact same device as mine and it works so we thought that it was the usb connector on the device and we switched my connector with his....NOTHING happens. computer wont recognize the device, no sound, no pop-up, no ADB detection. Does anyone have the same problem or a solution on how to downgrade 5.0.2 back to 4.4 without usb cable?
Thank you
Did you tried out to start n7 into fastboot mode and recovery mode?
Is usb not available also there?
fastboot and recovery mode also has no USB. absolutely nothing happens. when i connect the device it charges but the lightning icon does not appear on the battery in the status bar. and its not the usb port on the N7 i changed it.
?????????????????
Same here
I have the same Problem - a N7 GSM with 5.0.2 and no communication via USB.
I have tried different computers with Win7 and Ubuntu14.10. As well as differnt cables. (And all combinations of that work with my HTC M7, by the way)
Under Linux, not even lsusb shows the device, or dmesg shows any connection to a usb device.
To be completly honest, I did not give much love to my N7, I have been using it hardly. But when I did, I have been flashing some differnt Roms and testing different bootloaders so this might be some kind of my fault.
i updated to 5,1 and still the same problem so i assume its hardware related. but i know it is not the USB connector because i tried it on my brothers N7. and it works
Mine is quirky, comp recognizes it and can order boot but sideload and push to device don't work. Its odd.

FYI - Fastboot Protocoi Error

I was having an incredibly hard time flashing an image via fastboot, until I realized that my USB 3.1 GEN1 type A to type C cable didn't work well when plugged into a USB 3.0 port. I suppose it might have something to do with the N5X only supporting USB 2.0 or maybe it's a funky cable. I thought that I had indeed broken my phone on day 1.
At any rate, once I plugged it into a USB 2.0 port, fastboot is working just fine. I hope this saves someone from panic, crying, and the inevitable rage quiting.

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Same problem here please help
Same issue here
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