I just want to report a little feedback about EFI testing distribution. I wasn't able install debian wheezy on my Dell Inspiron 14z. Same problem both for the official beta4 build and the test build 5  : black screen. When I boot the cd it shows the main menu correctly but when I click on "Install" (both graphical and textual) the screen becomes black and I can't do nothing. I confirm that the same cd work when booting whitout EFI.