Hard drive not mounting or being recognized by my MacBook???

Hello,
I have a Glyph external hard drive that, all of a sudden, is no longer being recognized by my computer. I does not show up in the system profiler nor in disk utility. It connects using firewire. I have connected my digital camera via firewire recently and it was recognized. I have also connected this hard drive to another (newer) mac and it has no trouble recognizing it. So it's seems that it is not the firewire jack in my computer that is problematic nor is in the actual cable. Any suggestions? I don't even know where to start as a i have nothing to work with.
Thanks in advance.
Message was edited by: governorsir

hello,
as recommended in the link that was referred to me i have tried zapping the PRAM and
resetting the firewire ports. I was unable to turn off the spotlight indexing on the drive because it (the external hard drive) is not being recognized by my computer. Resetting the NVRAM does not seem to apply to my situation.
Still no change.
I just tried plugging in another external hard drive which is a newer glyph and it was not recognized through the firewire BUT it was recognized when i used the USB port. My hard drive only connects with firewire, this newer model (which is a friends) has multiple connections, hence the USB and success.
I don't know where this leaves me. It is obviously the firewire port or jack (whatever its called) in my computer that is troubled. I dont know what further steps to take.
I have contacted Glyph tech support and they seemed baffled. They recommended that i send in the HD so they can update the firmware (although they said it was "a shot in the dark"). Both my computer and my glyph are no longer under warranty so i obviously want to be sure i put my money towards the most likely conclusion.
Any further things i can try before i send the glyph out? anything?
thanks so much.

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Steve Porritt wrote:
Has Western Digital done something different with these newer drives? How can I get this thing to mount after a reboot?
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