I have an old iMac Graphite (color) ... the high-end iMac made before they changed to updated model (about 10 years old).

I'm trying to get a few more months out of it.

About a month ago, I installed an OSX disc into it, and it of course wouldn't load.

But, since, my monitor is way screwed up. Sometimes it won't even show up. Or, it's super dark. Or askew. And, it's not a Control Panel monitor issue. I use that to try to improve the quality of whatever I'm forced to deal with.

Is this a simple fix? Or should I just steal my new iMac now?