Not too sound like newbie, but i am, but how do i do updates???? and what do they do????????
You can go to the apple menu in the top-left of the screen, click it and you'll see an option for 'software update'. Assuming you're connected to the internet, Apple will then tell you what (Apple) software you have that has updates available. It's could be there will be quite a lot, so set some time aside for this, especially if your internet connection isn't fast. You can uncheck any you don't want to update and go through the same process another time if you don't want to do it all at once.
It's fairly self-explanatory once you start. As to "what do they do", generally the OS updates fix small bugs, address security flaws, and occasionally add or modify minor features in the operating system. Software update will give a brief description of what each update does if you click once on each item in the list.
As to your problem with the disc drive, if the software update (which you should do regardless) doesn't help then it could be your keyboard's eject key is a little stuck or broken. If you have another keyboard to hand, that might be worth doing just to see if that's what the problem is.
If you're using the original chunky white/plastic G5 keyboard, you could gently prise the eject key off and make sure it's not filled with dust or gunk underneath (blu-tack is great for picking up stuff out of keyboards). They keys come off reasonably easily if you gently lever them with a small screwdriver, and you can press them back in to place afterwards.
Another option would be to try dragging a disc to the trash (which will eject it) or selecting it in the Finder and using the 'Eject' command in the menus (or pressing command(the apple key)+e). Trying all of these these could further narrow down whether the problem is the keyboard, the specific key, or something else.
