EXACT same thing that happened to me. Now I have a black screen only no matter how many times I turn on or off the console and it won't let me enter recovery mode (only turns off or on).
It sounds like from your later posts you are at least able to see something other than a black screen. How did you manage to do that? I still see a black screen only no matter what I try.
Not sure, to be honest. At first i got a message saying my system was corrupt and it would take 3hrs to restore. I freaked and figured i'd lost everything. I left the system on all night and when i woke up it was off. I turned it on and to my surprise i actually saw the Rogero logo to indicate that i was on CFW. BUT, once i tried going into MM, or playing Duplex releases from the XBM, it wouldn't work.
I can play a ps3 game from disc, but quitting it through pressing the "ps" button the system gets frozen. I updated to MM 4.xxx whatever and when i click on it i get the little stars in the background but it stays like that. I can still play music or view pics in XMB so i'm not completely paralyzed.
I can confirm i am on 4.21 Rogero. I can turn my system on, get an error message saying the system experienced a critical error. I choose to ignore it and then it takes me to my profiles from where i can log in. After that its the aforementioned.
My question is now, and i'm gonna try in a bit; can i simply go from here (4.21) to 4.30 Rog? When i tried going from 4.21Rog >3.55OFW, i got an error message. Next i'm thinking going from 4.21Rog to CFW3.55. I can get latest MM but will that really solve the problem? Also, i hate to ask but the MM folder has a bunch of stuff in it. Do i need to transfer everything to ps3 via USB stick, or just the .pkg file containing the MM specific file? Or am i supposed to use FTP to do the transfer?
Ironically, me and you are fucked now since Duplex is releasing an eboot for virtually every god damn new game that has been released. I'd be perfectly fine had i stayed at 3.55 Kmeaw...