So I was working on a PC build of mine and unplugged my G5 to hook the PC up to my setup. Hours later I unplugged it and set my G5 back up. I went to boot it and was hit by a weird graphical issue on the Apple boot screen. It was a solid rectangle with what looked like analog television static in it. I rebooted it, and it went into open firmware. At the top it said something like "Bad memory access". I typed mac-boot and it went to a screen that looked similar too when you remove the RAM from a PC while its on. I figured it was my 256MB stick in the lowest slot. I removed it, and it booted perfectly. Although when I checked my RAM, it said I only had 1GB. But without that 256mb stick, I should have 1.25. So I checked System Profiler and it didn't see my 256MB I have in the upper most slot. And whatever other 256MB I stick in the top, it won't see, and whatever I stick in the bottom renders the system useless. Has anyone seen or heard of this before and are able to help me? I am writing this on said G5 right now and all is well within Mac OS, but other than that I have no idea whats going on. ~Edit~ I removed the two 512s that were in the middle slots and replaced them with both the 256s and it works. OS X finds both of them and displays 512MB RAM. But when replaced with the 512s and the 256s placed back into the upper and lower, the top one isn't found, and the bottom renders the system useless unable to boot. ~~Edit Edit~~ I recorded a short video that explains this a little better. I'll upload it to youtube and share the link when it goes live. Just a weird issue that my mind can't solve at 6AM with no sleep. Also this is the last day of summer before school starts up again. So this is total insult to injury right here.