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Power management problem in MacBook 13 firmware?

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After installing the Tiger 10.4.7 update, I have seen various problems with powering up my MacBook. Once powered up, I don't have any visible problems. Only after powering down, the problem arises. When I go to start the MacBook, the screen goes all

After installing the Tiger 10.4.7 update, I have seen various problems with powering up my MacBook. Once powered up, I don't have any visible problems. Only after powering down, the problem arises.
When I go to start the MacBook, the screen goes all gray, then it looks as though the LCD update stops. The screen slowly fades to colored vertical lines, then goes white as if the clocks to the LCD module have stopped, or at the wrong speed.
The solution that I have found to overcome this is to clear the PRAM (ALT-CMD P R) and to then hold the power button until the white led blinks fast. I get a long tone from the speaker, then the machine boots normally.
I suspect that something in the new 10.4.7 update is causing the PRAM / Power management system to become corrupt. Any thoughts?
Thank you.
John

The replay answer
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Thanks for the reply. I don't consider the LCD lines a problem in themseleves. There is something that changed when the 10.4.7 update was installed that has caused an issue with the startup.
Just to be clear, I had backed up, repaired permissions, checked my HD media, and followed Apple's recommended action before installing the update (as with all other updates).
My educated guess, having designed hardware and firmware for a number of years, is that something is corrupting the PRAM or other startup prior to getting to the HD. Until we start looking into the underlying problem with the update itself, the problem will continue.
It is important to make sure that there are no underlying problems with the system before installing an update. However, in this case, it is clear that there is something wrong with the update / update process with 10.4.7.

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