I have a iMac G5 that I bought right when they came out, so in 2004 I think. Its a 1.8 GHz PowerPC G5, 2 GB DDR SDRAM (which I just upgraded to about 1 year ago), and I am running Version 10.4.11. I have about 10GB of memory open, the rest is full, so I am aware I need to free up more space, just on the fence about how to do it. So, the problem is today I turned it on, opened Safari and was playing on Facebook, I had it open maybe 5 mins when the screen started to pixelate but first I thought Facebook was just being weird again, when it started happening to the whole screen. Then I moved the mouse to shut down Safari and a block of yellow and black started filling the screen and thats when I manually shut it down. This has happened before, maybe in 2006 and I had to get it fixed, but I do not recall what was wrong with it. Any ideas? I haven't opened Safari again because I don't want my computer to crash. I absolutely love this thing and while I do have some things backed up, I'm storing lots of important things on here. Is it time I just bought a new computer or should I buy an ext hard drive and maybe this is just a storage issue, or do I need to take it somewhere? I'm just wondering if, because its about 6 years old now, if its worth to pay to get anything fixed? But I just upgraded everything about a year ago when I bought more RAM. If I were to get a new computer, can I take this RAM out of here and put it in the new one? Or would that all be wasted? Thanks for any help. I don't know how long Mac's should last as this is my first one, and I know very little about maintenance on them.