Black Screen and White text at startup

Greetings, I recently installed the latest security update so I don't know for sure if this is the cause or a coincidence. When I startup my iMac G5 1.8Ghz PPC I now get a black screen with a lot of white text instead of the ususal grey screen with the apple logo. The computer does startup and seems to function OK however but this is total weirdness. I downloaded and reinstalled the 10.4.8 combo PPC update. I booted from my backup drive and it still does this. While booted from backup I ran repairs on permissions and disk repairs and then I ran DiskWarrior. Still flakey. Last week the power suppluy and logic board were replaced as part of the iMac G5 repair extension program from Apple but this behavior started immediateely after the latest Security update was installed as recommended by the software updates application. Any insight is appreciated. Thanks for reading this and thanks in advance for any help.
iMac G5 1.8Ghz PowerPC G5 Mac OS X (10.4.8)

I zapped the PRAM and all is well now.... Weird! Thanks to all!
One of the settings in the PRAM can cause the Mac to act like a specific keyboard shortcut was pressed at startup; in your case, it was the verbose mode shortcut, which is Command+V. Some utility software packages can toggle this setting, and it can be changed from the Terminal.
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I have a 2010 15" MacBook Pro, just got it in June. Had to send it in for a logic board replacement and now have it back. Everything works great except now instead of having the standard Apple greyish startup screen, I have a black screen with white text that scrolls through all of the startup stuff. I figure they changed some line on a plist somewhere so they could watch the startup and make sure everything was OK, then forgot to change it back.
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Kappy:
Thanks for the reply. I looked at the plist, but the -v was not there. Here is a copy of the plist:
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