Apple Logic Pro /LogicExpress Discussion

<sorry if this is a duplicate.  I've had email bouncing issues>

Hey, I just had a scare last night.  My external FW800 audio drive wouldn't mount and was not 
detectable to DiskWarrior or Disk Utility.  I assumed the drive was damaged, then realized 
that my FW interfaces (FP10 & 828) were not working either.  Restarted the Mac - nothing.  
Left it overnight and today everything works fine.  But Im still a little skittish, and need some 
advice:

1.  Is there software that can test the bus and detect problems that might be causing erratic 
behavior?  I'm guessing not.

2.  If I add another FW800 PCIe card, will I be able to boot from any drives attached to it?

3.  What would you do, if anything at this point?

Thanks,

Gregory