I can't access the Startup Manager

I hit the power key, hear the 'chime,' and press the option key. I hold it down. Three minutes later, the screen is still black. I have successfully accessed the Startup Manager in the past with no issue. It simply won't happen, today. I have Snow Leopard and apparently Maverick installed - each on half of the hard drive. I had normally simply booted to Snow Leopard (which I need to run Final Cut Pro - not Final Cut X) and taken care of business. Since upgrading to Maverick from Lion, the computer has defaulted to booting into Maverick. I have used Startup Manager to boot into Snow Leopard. That simply won't happen today.

I hit the power key, hear the 'chime,' and press the option key. I hold it down. After answering this question, I am going to try to restart after selecting the Startup Disk in System Preferences - hopefully, that will work.
As for the Disk Utility - yup, both partitions show. One is Macintosh HD (with Maverick), the other is Macintosh HD SL (get it? SL for Snow Leopard :-D ) At any rate, even if the SL partition didn't show, shouldn't the Startup Manager open rather than the black screen? I help the option ket for a solid 5 minutes on the recent attempt with still no success...
Please, don't take my snippy response as an attack to your question. I am simply frustrated with this situation and need a vent...

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