In the wake of Apple's recently-released MacBook Pro EFI Firmware Update, a number of users are apparently finding themselves without a usable screen.

According to AppleInsider, assorted users, especially those with external displays attached, are discovering that their computer screen refuses to display an image even in circumstances where the system is completely responsive.

"From as best I can tell, the MBP is booting up with no problem, I just have a black screen," said one user on the Apple discussion forums. "I let the computer start up, and run for several minutes. I then sent the keyboard command to log off, and I could hear the computer activity increase."

Common solutions, including resetting the PRAM, appear to fail, although a small number of users have discovered workarounds by restoring firmware and deleting display sleep preferences. This appears to be hit or miss and the problem remains at large with no official comment from Apple.

If you've seen this problem or similar circumstances on your end, let us know over in the comments or forums.