I get that "blank screen" provided the boot up included a blu-ray movie already inserted in the PS3. Like, left it in from the night before...and then started the PS3 the following morning. Just a dark grey screen displays. No sound, no video. As you indicated, I can press buttons on the controller, but to no avail. In *my* case, a second, third, plus...reboot doesn't change anything. I have to eject the blu-ray title and then re-insert it again.
1.32 here as well. And I can't say as I remember this occurring in earlier revs.