Satellite L505D-S5965 got shutdown, hibernate and sleep problem after Windows 7 upgrade

Question

I bought my Satellite L505D-S5965 last August. Everything worked fine on Vista. Last month I upgraded it to Windows 7 (Home premium, build 7600), then it started having problem to shutdown, hibernate and sleep. Half of the time, it will shutdown, hibernate or sleep just fine, however, the other half of the time it just never turns off.
For shutdown, it will go to the shutdown screen for 10 minutes until the a blue screen comes up, telling something about windows experience a crash and dumping memory, then it restarts itself.
For hibernation and sleep, it will go to the normal black screen but the hard disk light never turns off (i.e. the hardisk would keep running forever).
It will be a big help if someone can help me with that, I just don't want to keep doing the "hard turn off".

Answer 1

Hey thats great posting and detailed, thank you! :)
Im wondering how you found it out.
But I want to add something: Before you do or change something in Windows registry, make a backup of it. In worst case you restore the old Windows registry. Just to be sure ;)