On restart sometimes there is a clicking noise stopping machine starting!?

I restart the machine, all goes well but when its about to boot up there is a clicking noise coming from the DVD area, also there is a flashing light in the RAM area.
I have included a quick video as its probably easier to see... It only happens sometimes. I have done a clean install of SL but it has done this on previous copies. The machines is 2007 model.
http://gallery.me.com/alex_skylarking#100270
Hardware Overview:
Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 5 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP21.007F.B06
SMC Version (system): 1.15f3

stopped after a reinstall

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My time capsule cannot connect to my system and I get an error msg -6753. I also get a clicking noise when I start up. I've tried every thing from re setting, un plugging and re setting but nothing works. Anybody have the same problem ?

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A "clicking noise" is often a sign that a hard drive is malfunctioning. Suggest that you power down the device and take it to an Apple store to have them take a look, or contact Customer Service at Apple for instructions.

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Also, the computer doesn't recognize at all that there is anything in the USB, So I can't even reset the iPod. I'm stuck for what to do, It wont play or do anything, just when It has battery Will bring up the apple logo, make a clicking noise and repeat this, over and over.

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here
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Welcome To Discussions djmills!
A clicking noise when you start the Mac is not a good sign! Your HD is possibly failing.
Backup as much as possible ASAP!
When you have finished doing that, run Repair Disk and post the results.
I would elaborate, but I really think you should do a backup before continuing use.
EDIT: I just reread your post, and realized that you wrote "Every time I click on the hard drive...". What do you mean by click?
ali b

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On restart sometimes there is a clicking noise stopping machine starting!?

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