Folks, Though this forum doesn't see as much technical stuff as the one for Mac Pros, I thought you might be interested in this. I bought 2x4GB Crucial RAM sticks so I could deal with the fact that SL 10.6.6 pages rather quickly with only 2GB of RAM. When I installed them and then fired up several VMs, I noticed that every time I used more than 4GB of RAM, it kernel panicked. Then, when I turned it off and then on again, it stayed with a blank screen and beeped once. I reseated the RAM and then tried again. Same result; kernel panic. I did learn that after a kernel panic, if you reseat the RAM, you can boot again. So right now you're thinking, "okay dummy, everyone knows you can't use more than 4GB in the Macbook 5,2." But hold the phone, because I booted up Windows 7, and it worked perfectly. I ran a bunch of VMs and opened all the programs I could think of, until I had less than 1GB free. So at least 7GB was in use, and it worked great. I tried the Windows Experience or whatever it's called that assigns number values to your hardware specs. The RAM passed the test fine. I also tried another program, Performance... something or other... The RAM was fine. [pics or it didn't happen, right?] Note that the Total ram is 8GB, and available is 1.2GB (free). So what this means is that any claims of "this is a hardware issue" are just not true. It could just be that the Macbook 5,2 Snow Leopard kernel is just hard-coded for 4GB, and crashes whenever trying to address RAM at any higher location. Tests with the 64-bit kernel of Snow Leopard are pending. Tests with 64-bit linux are pending.