Is my Power Mac G5's Hardware Causing Problems?

If any more information about the mac is necessary just post a message here.

1. I just changed ports to make sure. When I connected the cable to Port 1, it worked. When I connected the cable back into Port 2, the working port, it isn't working, and when I switch the cable back to Port 1, it isn't working. Then I disconnected everything, reconnected everything, then turned the computer back on. Now the port is working. Is there a problem with the ports?

2. That's great.

3. 10.1.102.64, 10.3.183.90, & 10.3.183.90

None of the three listed Flash Player versions worked on my Power Mac G5.

1. I just got the display working again.The second port has the display attached now.

3. It actually gives the same error message each time "The following install step failed: run postflight script for PlugIn. Contact the software manufacturer for assistance."

Has the Apple Support Communities been working properly? I didn't get your message until now.

I repaired all the permissions using safeboot and uninstalled all previous versions of Flash. I noticed that the mac has no set application to open .izma files. Is this why I can't install Flash?

I decided to switch my Power Mac G5's cable with the second cable from my Mac Pro. Which fixed the random blackouts. However, the issue didn't persist on the Mac Pro. Is this problem caused by the Power Mac G5 or the cable?

The file is .izma. I however tried to open it with the Unarchiver, which didn't work since it wasn't a file compatible witht the application.

10.1.102.64: http://fpdownload.macromedia.com/get/flashplayer/installers/archive/fp_10.1.102. 64_and_9.0.289.0_archive.zip

10.3.183.90:

http://fpdownload.macromedia.com/pub/flashplayer/installers/archive/fp_10.3.183. 90_archive_mac_only.zip

I have tried manually installing it at the suggestion of someone at the Adobe Flash Player Forum. I did this using Pacifist to manually extract and install the files. Which also failed. Is this relevant?