Weird booting problems since 10.7.4 update

I have a 2006 MBP 2,2 which is now taking over 10 minutes to boot since updating to 10.7.4.
When it boots the Apple logo does come up almost straight away, it then stays for 5-6 minutes, before disappearing to the 'linen' for another 5 minutes, then the login screen comes up. From there it enters the desktop normally and afterwards the computer is as responsive as it ever was under Lion (ie not very!).
I have repaired permissions and I have verified the disk (which reports no errors).
I cannot reboot from DVD as the superdrive is toast. However, I cannot reboot in Target Disk mode either. Holding down T when the computer boots up leads to nothing happening, no Apple Logo, just a grey screen. Going into Startup Disk and telling it to reboot in target disk mode caused me no end of stress! When it rebooted nothing happened again. Eventually, after hard restarting it several times, I left it. No less than 25 minutes later, 25 minutes!, the Apple logo appeared and it booted normally (ie its 10+ minute boot into the OS).
Holding down shift, C, D, Command-V, Command-S leads to nothing happening at restart (or maybe it is just that I get bored of holding them down after about 5 minutes), however resetting the PRAM/NVRAM with Command-Option-P-R worked in a few seconds as I would expect.
Any ideas ?? (At nearly 6 years old it will not be going to be repaired by Apple.)
Cheers.

See if this is the explanation to your problem:
http://reviews.cnet.com/8301-13727_7-57451440-263/thunderbolt-update-plaguing-ma cbook-pros-with-kernel-panics/
Ciao.

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