My newish 2012 mini is hanging for ages (possibly indefinitely, certainly several minutes) at the white screen when starting up. There is no apple symbol, it does not respond to keyboard input such as holding shift for safe mode etc. it doesn't even get as far as powering up my FW800 external drive (although there is power to the USB bus as lights come on on other peripherals). The only thing I can do is power down again by holding the button. I have heard this and similar issues referred to as 'the white screen of death' and the solution for some people seems to be PRAM resets or SMC resets. I managed to do a PRAM reset once, not sure how, I just got lucky and it responded to the keyboard. THis appeared to solve the problem, but now it's back and I can't reset the PRAM as it no longer responds to the keyboard. I'll try an SMC reset tonight. Is there any way I can diagnose this, any kind of log that is produced? I tried starting in verbose mode but again no response to the keyboard. It's very disappointing as I spent a lot on the mini and I've already had black screens to contend with, now I've got white ones! Could it be another HD4000 bug? Is there a handshake process over DVI which could be stalling the mini?