I have been searching and I haven’t seen this exact issue brought up, but I have some similar issues and no responses. Let me walk through this issue…
So I have the latest software (Both Apple firmware/jailbreak/FireCore)
I jailbreak, install FireCore, install all the extras I wish to install and remove the software update feature. I don’t really mess with anything at this poing. I install XMBC and set up some shares.
I unplug the ATV and then change the password on my home network OR take the ATV to a friends house with a different wireless setup.
I power on the ATV, get the Apple logo then nothing. I loose HDMI handshake and it never comes back. I have done this with 2 different ATV2 and I get the same results.
I’m getting really good at jailbreaking this thing and setting everything up every time I experiment with it because that’s the only way I have found to get back into the ATV. Any ideas?