Help please!

My late 2009 iMac 21.5" Intel Core 2 Duo 3.06GHz 12G RAM with OSX 10.9.5 
Mavericks fails to complete the start-up sequence.  

Mac was powered off via Apple - Shut Down.   Power-up sequence starts normally: 
chime and grey screen, then the Apple logo and daisy wheel.  Then I get a 
progress bar as if it is loading something (I don’t recall if this is normal).  
After about 5 percent progress the bar disappears, the daisy wheel continues 
for a second or so and then the screen goes black plus silence from the 
internal hard drive.   

The only wired peripherals are two WD My Book Studio Firewire external hard 
drives in tandem (one cable from Mac).  Tried powering up with the Firewire 
cable plugged in (normal) and then unplugged.  No joy.

I tried starting in Safe Mode but could not do so.  There was no change, but 
possibly a slightly longer time interval between chime and daisy wheel.

Other observations, but may be red herrings.  I used AirDrop to move EyeTV 
recordings to the iMac this morning.  Came back 30 minutes later to move the 
videos to a WD My Book Studio for iTunes.  Noticed that one of the two external 
drives did not show in Finder.  I powered off the iMac so I could access the 
drives, power cords, etc.  Then a few minutes later I attempted to start up the 
iMac - - -.

Regards, 
Alan








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