Looking for some thoughts, I'm about out of ideas. I have an old 1,1 firmware upgraded to 2,1 that won't boot past the spinning apple logo. I've tried all the usual things (SMC, PRAM, reduced config, etc). What throws me off is between two boot volumes (10.11 and a 10.7 install) neither will boot, nor will a fresh 10.7 USB installer. All get stuck at the spinning apple logo/progress bar. Verbose reveals it seems to get stuck and different things each time. Any thoughts? About to scrap it.