Need Help. I have seen raw photos degrade in front of my eyes while in lightroom 2.4.

I thought I had a bad card but it has done it on two different ones. If I look at images in main folder with quick look they look ok. I am using a power mac G5 1. 8 ghz 3. 5 g ram. i notice when I manipulate the image in and out of library to develop mode my fans start up. Makes me think my mac is to old for lightroom. any ideas? These photos get color stripes on them some 100% of the photo.
Robert

OK, that means that the files are probably OK (make sure they are in preview
by hitting Apple-0 on one to zoom in 1:1). Probably your ACR cache is bad or
your previews are bad. You can purge the ACR cache in the Lightroom
preferences (the File Handling tab). That might already clear up the
problem. The previews can be regenerated by selecting a group of pictures,
and hitting "render 1:1 previews" in the previews submenu in the Library
menu. If that doesn't help, go into Develop and zoom in 1:1. The red lines
should disappear as Lightroom will rerender from the RAW. The hardcore
method of making Lightroom rebuild previews is to trash the previews.lrdata
folder that you will find right along your catalog file (lrcat extension).
Do NOT delete your catalog!!!! Just the previews thingie.

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