I've been trying to install Cyanogenmod on my Samsung Galaxy S2 (GT-I9100), following the official guide.
I was successful in installing Clockworkmod and can enter the recovery mode. The problem starts when I try to wipe/format my sd card. It fails, saying something like "cannot mount /sdcard".
If I go to mount/storage and try to mount the sdcard I get "error mounting sdcard". And I get something similar of course if I try to "install zip from sdcard".
If I boot my phone normally I get the Samsung logo (yellow triangle included) and then it goes to black. Access to the sdcard via usb is not very consistent (screen is black so I don't know what's going on, but when I plug in the usb sometimes I can see the sdcard in my computer, sometimes not, and when I can it gets disconnected often).
Maybe it is a problem with the sd card? I wasn't having trouble before this, except maybe very slow access sometimes (which I blamed on Samsung's bloatware).