Screen Goes Black During Startup (after login)

Hello,
I have a 2005 Mac Mini PPC OS 10.4.11. This is the first problem I've had since purchasing the computer. This problem popped up out of nowhere. The screen goes black during startup just after I login into my account. I can hear the hard drive spin like it is finishing the startup process. The monitor power button blinks green.
I'm using the digital video cable. I tried switching to the VGA cable but the screen then goes black before the login screen.
The computer will startup in Safe mode.
I've tried Disk Utility (repair disk and repair permissions), Techtool Pro, Drive Genius, ColorSync Utility, Reset Pram, installed latest OS updates, and even re-installed the System twice (once because I removed all the Extension files and then the computer would not startup at all).
I've also tried removing cache files, plist files, startup files, preference files, and some or all of extension files.
The only applications I have recently installed were QuickTime Pro and a .flv movie player; both about a week before this problem started. I tried to uninstall them but could not figure out how.
What is the problem? How can this be fixed?
Thanks.
Richard

Howdy. I have Had the same problem as you in regards to a ViewSonic Monitor and the Mac Mini. This is my post:
Monitor failure when switching resolutions
Using Displays with the Mac mini, Apr 1, 2008, Replies: 2
Running 10.5.2 on Mac Mini G4 1.42 Ghz with ATI Radeon 9200, 32 MB VRAM and ViewSonic VX922
When switching resolutions from 1280x1024 to 800x600 or vice versa, the monitor will cut to black and the power light on the monitor switches from solid green to flashing green. Only by combinations of powering down the mini and starting it up again with the monitor on or off will bring the monitor back to life. This problem makes it difficult to play World of Warcraft amongst other games. Any feedback in regards to this problem would be appreciated.
Thank You!
At this point, I am unable to switch Monitor resolutions. If I do, the monitor goes black, and I have to power everything down and wait a while before I can restart.
I've resigned myself to not switching resolutions, but I'm wondering if you've had any luck.
Thanks for your time!
Kevin

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    com.apple.driver.AirPortBrcm43224  428.42.4
    com.apple.driver.ACPI_SMC_PlatformPlugin     4.7.0a1
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    com.apple.driver.AppleIntel8254XEthernet 2.1.3b1
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    com.apple.driver.AppleProfileTimestampAction  10
    com.apple.driver.AppleProfileThreadInfoAction  14
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    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
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    2   com.apple.CoreVideo                   0x00007fff82fbade6 CVDisplayLink::waitUntil(unsigned long long) + 252
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    5   libSystem.B.dylib                 0x00007fff87acefd6 _pthread_start + 331
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    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
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