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Do you have one of the toolkits installed on your PC?
i bricked my n7 and gnex more than once all i had to do was plug and unplug my charger and refresh the menu on my all-in-one toolkit till it showed up then i selected the option to reboot- then reboot into cwm... maybe it will help you. maybe not
thats correct.. its totally deadHi, welcome to AF! :ciao: I'm gonna guess you can't get into fastboot at all, correct?
Do you have one of the toolkits installed on your PC?
I've never experienced this before.
What is the tablet able to do? Can it boot up? If you try to boot it while holding down power and both volume keys what happens?
Unfortunately, this won't work in this case. Without a bootloader, the device essentially doesn't know how to boot anything. That means it can't boot into fastboot, recovery, or system. Giving it a command through the terminal or a toolkit to boot into something won't help because then device won't know how to do so.
thats correct... so there is a way to fix it. and it is with nvflash. BUT, it just work for the Asus Transformer... so im waiting for the nexus 7 app...

Cmon people these things aren't built with the bootloader on them.
Think man, think!
When you try the vol down + power to get to bootloader does the screen show anything?
I tried this on my N7 16gb and here is what happened: Booted to fastboot, issued "fastboot erase bootloader", successful no other selections, power + vol up did nothing. Powered down, used vol down + power, got into bootloader screen showing the <START> option only. Fastboot devices did see my N7, issued fastboot reboot-bootloader and came back with all the options. Tried this again, same results. Then I booted to recovery, reflashed my bootloader zip file with CWM and the bootloader was normal with the hardware buttons again.
Can't say why this worked, but went through the whole process twice and it did.
I don't recommend anyone try this though, maybe I just got lucky or something?
EDIT: some other info. When bootloader had the <START> option only, pressing power on that option DID boot the device, so maybe my bootloader wasn't completed erased? Also, I'm on JB 4.1.2 but I'm using grouper bootloader 4.1.3 from the JB 4.2 build.
My brother erased de bootloader with "fastboot erase bootloader"...
How can re-install de bootloader on my nexus 7?

Cmon people these things aren't built with the bootloader on them.
Think man, think!
When you try the vol down + power to get to bootloader does the screen show anything?
I tried this on my N7 16gb and here is what happened: Booted to fastboot, issued "fastboot erase bootloader", successful no other selections, power + vol up did nothing. Powered down, used vol down + power, got into bootloader screen showing the <START> option only. Fastboot devices did see my N7, issued fastboot reboot-bootloader and came back with all the options. Tried this again, same results. Then I booted to recovery, reflashed my bootloader zip file with CWM and the bootloader was normal with the hardware buttons again.
Can't say why this worked, but went through the whole process twice and it did.
I don't recommend anyone try this though, maybe I just got lucky or something?
EDIT: some other info. When bootloader had the <START> option only, pressing power on that option DID boot the device, so maybe my bootloader wasn't completed erased? Also, I'm on JB 4.1.2 but I'm using grouper bootloader 4.1.3 from the JB 4.2 build.