Booting Blues(Grays)

Man if it ain't one thing its another lol. just recently bought a early 2009 Mac Pro (Maverick 10.9.1) with 12 GB memory, 4 hard drives (total 8TB) stock graphics board and one superdrive (stock) and one pioneer Blue ray drive installed, the system had been running fine until I rebooted last night. I had added the program pathfinder and it was running fine before rebooting so that is the only thing I can think of that I have added to the system since the last reboot. anyway now all i get is the gray screen with the apple in the center and the spinning wheel near the bottom of the screen. I even tried rebooting holding down the "shift" key and the only difference is I got a hollow bar centered near the bottom along with the apple and spinning wheel above it. it started filling in the center and then half way through it went away and once again I was where I was with all the other attempts to boot the system.

I've tried rebooting using the shift key, no luck same gray screen and spinning wheel tried booting using the cmd+shift= V keys, nothing at all then I tried cmd+shift= V to watch what was happening during a safe reboot and it came to the line

unable to open: /var/db/bootcache.playlist: 2 no such file or directory

then nothing. I have also disconnected all usb externals while doing all this.

I tried rebooting using my external back up of the system. Holding down the "option" key I got a screen asking me if I wanted to boot the the internal 1TB drive (which means it saw it) or the external 2TB drive which means it recognized it also. I chose the external and it did exactly the same thing its been doing staring to boot (i can hear the hard drive) and then just stops with the screen being gray with the apple and spinning wheel.

I have also removed all the new components I had added to the system when I got it last week, no external usb except the keyboard and then the external (to try that to boot from). I also removed all the hard drives except the boot drive, the USB 3.0 PCI-e card, I disconnected the blue ray drive I had added and I removed all the new RAM I had added. This was just in case one of the new parts had gone bad.

I have tried eliminating any all all reasons for this set back, any other ideas out there?????????????

Thanks

Ed