MacBook suddenly froze, rebooted and now gets stuck

Hi,
These forums have been helpful in the past, so I thought I might try them again.
My MacBook circa 2006 (with a different hard drive and updated keyboard/trackpad section courtesy of Apple in mid 2009) has suddenly stopped working.  It was working fine until it suddenly froze.  I was playing music at the time and it looped the same 1 second over and over.  I powered it off by holding the power button.
I waited around a minute then powered it on again.  It did the chime, displayed the Apple logo, but then got stuck (it didn't get as far as displaying the pinwheel).
I attempted to reset the PRAM (descibed here: http://support.apple.com/kb/HT1379 ), which seemed to do nothing.
Also attempted to restart while holding CMD + S, which got stuck on the following lines:
IOAPIC: Version 0x20 Vectors 64:87
ACPI: System State [S0 S3 S4 S5](S3)
I don't think it's a hard drive failure - no clicking sounds and it seems to work properly (judging from the normal sounding HD sounds coming from it when I tried the CMD+S reboot).

Try starting in Safe Mode.
http://support.apple.com/kb/TS2570   
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 
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