MacBook does not startup unless I reset the PRAM.

Several times now I have turned on my MacBook and been greeted by a dead, blue screen. The computer does not load Mac OS X from this state. If I reset the PRAM (by forcing a shutdown and then holding CMDOPT+PR when the computer turns on) Mac OS X loads. Why does this happen?
I have made some modifications to the computer that may have influenced its performance.
1. Upgraded to 2GB RAM.
2. Uninstalled extra languages using the program Monolingual.
3. Disabled Dashboard.
4. Disabled Spotlight.
5. Disabled Journaling on my harddrive.
6. Repaired disk permissions.
7. Cleared logs and caches and ran Cron Scripts using the program Ultimate Task.

I think I have some other information, or hypotheses which i'd love other users to share information on.
I notice, that when i have this problem, that in System Preferences/Startup Disk that the MAC OS X system is not selected/highlighted.
Also, I was thinking, perhaps this is due to having bootcamp/windows installed ?
So 2 questions:
Do users experiencing this problem have Bootcamp installed with a windows system on their mac
and
After getting the dark grey screen and starting up (by resetting PRAM), does the System Preferences/Startup Disk that the MAC OS X system is not selected/highlighted ?
If this is the case, I guess we have a bit more information to go by...
If users that are experiencing this issue do not have bootcamp installed, then at least we can rule out bootcamp (since it is a beta).
If users are reporting the same nonselection of the system volume in system preferences, then at least we're talking about the same problem.

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