I have an Apple II Plus that is giving me some problems. When I boot to a prompt and run some basic instructions, everything seems fine until a few minutes pass (idle or in use) the computer freezes. I still might have a flashing cursor, but keystrokes are ignored. If I switch off the power and turn it right back on, I'm ususally greeted with a screen of white horizontal lines. If I leave the Apple off for a few minutes, it will usually work (no white bars.) I've also tested this with the floppy drive and booted up various games and apps. I get the same results. Everything works great until it just freezes up suddenly. I did find a few threads on this forum that featured some code to check the RAM but unfortunately every attempt to input this has ended with a lockup. I feel like this wouldn't be a RAM issue since turning it off and back on should clear the RAM and it should work and fail in the same way. Instead I get the video issue. Since giving the Apple some time to sit results in it booting up and working (for a few minutes) I feel like it must be something overheating. I don't think it's a video (chip?) issue because it's not like the video scrambles suddenly while in use. I've cleaned the board, I haven't buttoned up the case in quite a while, and I've removed all the expansion cards. Sorry if this is all stuff that's been gone over and over. Any help would be appreciated. I'd love this machine and I don't want to let it go!