10.4.7 has disabled my G5

Yesterday I installed the most recent OS X upgrade to my G5, and it's caused a lot of problems.
In order to boot the computer, I have to try several times, usually by unplugging the power source (because every other way is disabled) and hitting the start button on the computer. About a third of the time I get a black screen. Other times I get the gray screen with the Apple logo, but after some time a black rectangle covers the Apple logo and the machine stops booting. Sometimes instead of a black rectangle I get narrow black rectangles extending across the screen from the left edge rightward. Once I got a request to update the firmware. One time I got the machine booted after five tries, but the mail program (which also updated) froze the whole machine. Finally, on the next try, the computer booted up and functioned. I go through this every time I try to boot up. How can I fix this?
I have used Macs for 12 years, and this has got to be the worst machine I've ever owned. Apple computers seem like they're starting to deteriorate.

Good (and bad) to know it's not just my problem. Another thing that happens sometimes when the machine tries to boot is that the gray screen with the Apple logo appears, and then the fan starts spinning at full speed. It will spin as long as I let it sit there like that.
With this update, Apple is rivaling the standards of Microsoft.

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