Uses for an orphaned iMac?

Elbowgeek writes: "I was given a very nice G5 iMac with a 20-inch display. However it has a problem in which the system powers off suddenly when OS X is loaded — even if one just boots from an OS X DVD or CD. I did however get the system to run without a problem when I loaded Ubuntu Linux which is great, except that support for this platform is in imminent danger of ending soon. This lack of support means that I have essentially a brick with a beautiful screen.

I'd like to do something useful with this hardware, and one thought was that I could hack the display to plug into an external source, such as a PC video card. I've not seen any mention of such a hack in my searches on the web, but I'm sure it can be done. If anyone has any ideas on this, or has ways in which this great G5 hardware can be fully exploited before it is shamefully forgotten in favour of the Intel platform, I'd love to hear from this community.

Thanks, all."