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Yes I suspect PE9 does have a 'resources' leak.
When editing a large project I sometimes get a similar the warning to save and close due to low resources. Particularly when I add titles over a busy scene or effect.
The Available memory (in windows task manager) still shows plenty of memory is available.
This suggests that the program is written in a low level language that has the old problem of fixed limits of memory allocated to certain tasks and the warning comes when these are approached.
If the 'using up of more memory' is so great than this warning level is exceeded then you get a crash instead of a warning.
Various combinations of video cards seem to make it worse.
I always keep the preview window as small as possible unless I really need it big to examine detail.
I also keep the timeline thumbnails switched off until I really need them. It is surprising how much you can edit without them, using the preview window instead.
I agree with Ted that there is a resources leak in PE9. However for me things are now going well again and PE is behaving nicely. I'm not 100% sure which of these things improved it (maybe all!):
1. Just before Ted suggested it, I changed the timeline video view to the simplest one, not showing a clip at beginning or end.
2. I split my long project into 3 15-minutes projects keeping only the used media in the project, and deleting unused media. (One of my short projects did freeze however when I tried to add a new title, but then no further problems)
3. In frustration I downloaded and installed Cyberlink PowerDirector. It's almost as though Adobe knows and is making PE9 behave! Seriously though I wonder if there are some shared DLL's and a faulty DLL is now fixed. Unlikely but possible. On a separate tack, PowerDirector looks OK and has the interesting Particles special effects. Does anyone know what PE9 can do that PowerDirector cannot do.
4. An update came through for both PS9 and PE9 - I can't remember what it was but at the time I thought it was irrelevant to my problem.
5. I ran the BCEDIT command to increase RAM per app to 3 gb - see post below
So I am just finishing off my 3 separate projects, will output them each to a file and make a final 4th project to import the other 3 and render the final output.
I would actually like to combine the 3 back into one project at the source clip level (without intermediate files) but can't see any way of doing that.
On your original question, I would be very surprised if the power supply was giving any trouble unless it also does it when playing an ordinary HD DVD.
I had a computer some time ago that would freeze only when I showed videos, turned out to be the cpu fins were clogged with dust and the cpu was overheating.
It would behave perfectly with a static screen like a wordprocessor because the cpu was burning less power.
There are utilities that allow you to monitor the cpu temp while you are working.
I have just remembered something else I tried that may be the fix to the white screen freezes:
See http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_programs/increasing-ram -access-for-a-single-application/94be1162-27fa-436a-b216-7fae881e34a2 - I ran the BCDEDIT command to increase the limit of 2 gb per application in 32-bit Windows. Apparently 32-bit apps have access to 4 gb RAM, but 2 gb is reserved for the kernel and 2 gb for the app. I ran the command to increase the app amount to 3 gb. Thinking about it now that could have made a huge difference if it was indeed a resources issue.