2010 i5 3.6 21.5", Snow Leopard (10.6.8) I added 8 GB of RAM to the stock 4 in early December and shortly afterwards began to have random/infrequent system freezes with 3 beeps repeating until hard shutdown. Sought advice and decided reseating was the next step. Put it off but the frequency of these freezes increased dramatically over the last few days so I did a thorough and satisfying reseat a few hours ago. Ran for about 30 minutes afterwards before it happened again. I can find a zillion threads on various forums from those who have had similar problems, but I'll be darned if I can find one instance where someone came back and posted a resolution. The RAM consistently tests OK in any test I've thrown at it. Thanks for any pointers or links. ======Edits Feb 12==== Zapped PRAM after this initial post . . . 6 days no beep-freeze, until 2/11. Pulled stock RAM and placed 'new' RAM in main slots (farthest from display side). No freeze yet, ~ 1 day.