Patch 4.45 that has been released by Sony last week lead into complications and problems during boot process making some consoles impractical has now been updated with another patch (4.46), which removes and fixes these problems.
If you are still suffering from the problems because you updated to 4.45, here comes a step-by-step tutorial teaching you how to make your Playstation 3 useable again:
Obtain an USB-Stick with at least 195 MB free space on it
Connect the stick to your computer and create a new folder called "PS3" and a sub-folder called "UPDATE" (make sure to remove the quotes)
Patch 4.46 and copy it to the UPDATE-folder
Now press and hold the power button on your Playstation 3 for like 15 seconds until you can hear 3 bleep sounds
Press the power button again until you can hear a double-bleep sound - your console starts booting in safe mode
Now connect the aforementioned USB Stick to your Playstation and select "System-Update" in the menu
Press Start and Select on your controller at the same time - this will force the system to perform a restart letting the update process begin
Wait a few minutes and the console will boot automatically and you can use it just like before.
Sony mentioned that they fixed every problem with the newest patch and they also think that there won't be any more complications.