20 Most Recent Apple iMac G5 Desktop Questions & Answers

You probably don't have the right codec installed to play the videos you downloaded. Try installing Perian from http://www.perian.org/. This adds support for more types of videos.

If that doesn't work, try playing them with VLC: http://www.videolan.org/vlc/
VLC is a media player that supports nearly every format out there.

Use the disk provided with the printer

Usually this is caused by a USB printer unnecessarily clamoring for attention.
Disconnect ALL your USB devices and the problem ought to go away. Then connect them one by one to find out which the culprit is.
To zap PRAM, shut down the Mac, then push the start button and immediately hold down Command-Option-P-R until you hear the chimes pass by three times. But I don't think this will affect your problem.

That is a rather general error from an internet server. They usually occur when you are visiting a web page that can't be displayed properly due to errors in the code, in this case, they were trying to display HTML code from their system directly in your email. If it came in a spam email, you don't need to worry about it.
If it came from a company or person that you needed to see what they were sending you, contact them and tell them you got a 500 server error, and forward them the email so they can figure it out. It will have to be fixed on their end

change the stand-by settings! I’m happy to help further over the phone at https://www.6ya.com/expert/jason_5e1ab55420a90d8c

I'm not sure if these are what you need or if you have 17 inch or 20 inch, but here are links to the Mac service manuals that might help you out.

http://tim.id.au/laptops/apple/iMac/iMac%20G5%20(17-inch%20iSight)%2006-08.pdf

http://tim.id.au/laptops/apple/iMac/iMac%20G5%20(20-inch,%20iSight)%2006-10.pdf

http://tim.id.au/laptops/apple/iMac/iMac%20(20-inch%20Mid%202007)%2007-08.pdf

When you boot up g5 hold down the command button (apple logo) and the letter s at the same time to but the g5 in single user mode. When it boot in single user mode type fsck -f so it can check disk on the hard drive and repair Mac OS X. After it done doing check disk type exit and see if it will boot up regularly.

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