Putting my eMac for sale, I figured I should test it out before I show it to anyone... Well I booted it up and all seemed good until I moved the mouse towards System Preferences and it froze. I rebooted and tried again, it froze after maybe 30 seconds. Tried a third time, attempting to change the clock and it froze once again. It looks like a GPU issue because there are some faint horizontal lines in the top right of the screen. They don't cover the whole screen, they are just in one area; Same color as the desktop, some a little blurry and pixelated. The first two times, I couldn't move the mouse after it froze, right now I can, though I cannot open or close anything. Any ideas? The computer hasn't been powered on in four years. This was the first boot since then. Last thing I did was format, install Panther, and put it on a shelf.