Verifying disk came clean, but still unable to start up.

So, for the past few weeks I have had the problem of the endless spinning wheel while starting up my macbook pro. I have tried booting it up in safe mode, single-user mode, fsck, everything. So today I got the installation DVDs and I ran the disk utility verification and repair. It came up clean, and so did the Apple Hardware Test. I'm dumbfounded, what should I do?
Thanks

Zap the PRAM and Reset the SMC; then, try again. If no go, reinstall the OS.

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