Macbook Pro Slow to boot

Hi
I have a Macbook Pro 2.33 GHz Core 2 Duo with 2GB RAM. The problem exists with both OSX 10.5 and 10.6.
Basically the computer is very slow to start typically 6 minutes plus form Apple logo to login screen. However if I insert a firewire cable into the port we have normal instant start usually straight to login.
I've run the diagnostics both supplied and downloaded - no reported problems.
I've repaired permissions.
I've disabled firewire and reinstalled.
I've done a clean install without installing any 3rd party apps for both Leopard and SL.
There are no peripherals attached.
And now I'm really fed up with it. I'm beginning to think the logic board is faulty although if that is the case what is the point of running diagnostics?
Please any one have any ideas what to do next.
Thanks

Hi AFC,
AFC 1998 wrote:
Basically the computer is very slow to start typically 6 minutes plus form Apple logo to login screen. However if I insert a firewire cable into the port we have normal instant start usually straight to login.
Just so I'm clear, you connect just a FireWire cable, with nothing attached to it on the other end, and the MBP starts normally every time?
I've never heard of that, but try a PRAM reset and an SMC reset.
I'm beginning to think the logic board is faulty
It may well be. If a fresh OS install doesn't work, nor the PRAM or SMC reset, and if the RAM is known good, then it sounds like a bad LB (the FW port is built in to the LB). If that's the case, and you don't have AppleCare coverage, and you don't want to spend a lot to repair it, you may wish to run with that empty FW cable attached?

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